The Broken Pin Wrench Resurfaces

While testing out the new Operating Lever Latch Spring on my Monotype caster, I heard a clunk as something fell to the floor. It turned out to be the broken pin wrench I had lost inside the caster a couple of days ago. The vibration of running the machine had shaken it out of its hiding place.

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The left end is the one I broke adjusting the pump linkage rod length a couple of days ago. The right end, which was angled, was broken about a month and a half ago when I was adjusting the column pusher spring box length.

IMG_6980This is a (blurry, sorry) close-up of one of the broken ends. You can see the crystalline surface left by a brittle fracture. I feel that the tool was not sufficiently tempered after being hardened, leaving the ends too brittle to resist the forces encountered when using this tool to rotate a part.

I will probably make my own replacement, and although it won’t have such a nice knurled finish, I’ll make sure it is tempered enough to bend before breaking.

A New Spring for the Operating Lever Latch

While doing my last few casting sessions I noticed another part missing from my Monotype caster. There is a lever, called the Operating Lever, which controls the engagement of a clutch on the motor drive; essentially this is the lever you push to get the caster running under power. This lever, in turn, has a latch that holds it engaged. This latch has a spring, missing from my caster, which pulls the latch in the direction required to hold the operating lever engaged.

Without the spring, the latch will still engage because of gravity pulling on it, but this pull is relatively weak because of the orientation and shape of the latch. As a result it tends to bounce before properly catching on the operating lever. As you press in the operating lever, you can’t feel or hear the latch engaging so you can’t be quite sure you’ve pressed the lever far enough to latch. Furthermore, because of the bouncing of the latch, releasing the operating lever too fast might result in it not latching.

I asked Bill Welliver to measure the spring on his caster, and he obliged with the following two images:

Bills Spring  Dimensions from Bill

From this I bought the appropriate gauge of spring (music) wire, drew up my own notes and made a spring:

IMG_6972 IMG_6973

After doing a test coiling over a ¼″ arbor, I decided to use on slightly smaller to actually wind the spring. Another deciding factor in this was what I did not have a long enough piece of ¼″ steel rod handy. I also did not have the proper jig for bending the eyes at the ends of the spring to a central position. This means the spring will be a bit distorted in use and may have a shorter lifetime, but it will still probably outlive me.

IMG_6974

This shows my spring installed. You can see how the ends of the springs are stretched unevenly because of the off-center eyes.

The caster has a mechanism to release the operating lever if a line delivered to the galley is too long or too short (to a degree; lines more than about 2″ too short are not detected). This relies on the force from the column pusher (which pushes the line and all the already-set type down the galley tray) overcoming the latch spring and any friction. When I tested this after installing the spring, I found that the latch did not release; instead the spring box on the column pusher (intended to prevent part breakage if something jams) compressed and the line was not pushed onto the galley. The latch is reasonably well lubricated, so either my new spring is too strong or the column pusher spring box is too weak.

To get around this for now, I used a handy spring lengthener (aka a bent paper clip) to reduce the tension on the latch enough that the column pusher could overcome it and release the latch.

IMG_6981

That’s quite a bit of extra length and the spring is barely extended at all. This kludge will work for now, but eventually I should determine if it is my spring at fault or the column pusher spring box.

One other good thing happened when I was running the caster (with the pump off) to test the line length trip: the broken pin wrench which I had lost in the guts of the machine fell out, so I no longer have to worry about it jamming something.

February 23rd Casting Session

Last Sunday was another frustrating day of casting.

The only way I could get the nozzle to seal even remotely well was to have it clearly out of alignment, so it was moving sideways every time it rose and dropped. This is not good for the nozzle, since it tends to wear a flat spot onto it. It also means the nozzle is in contact with the mould longer than it should be, leading to a greater likelihood of nozzle freezes.

And I got nozzle freezes aplenty! I could not get an entire line cast without the casting stopping partway through from a nozzle freeze.

I had adjusted the nozzle height and pump timing according to the directions in Casting Machine Adjustments but I found that the resulting setting seemed to leave a lot of dead time between the seating of the nozzle and the start of the piston stroke. Furthermore, when I swung the pot open, I found that the pump would sort of pop out of its operating levers much more forcefully that it did when I was casting a couple of years ago. I have since found a different procedure in ‘Monotype’ Casting Machine Manual which gives a more sensible adjustment.

It would appear that between the publishing of these two books (1920’s and 1960’s) the linkage to the pump had been redesigned so that the pump castings would not be overstressed by the mechanism trying to lift the piston too far on the return stroke. Applying the old directions left most of the play in the linkage to be taken up before the piston moved.

Although it is newer and accounts for changes to the machinery over 40 years, ‘Monotype’ Casting Machine Manual still has its share of confusion. In the particular the section on adjusting the pump and nozzle states incorrectly that the force that operates the piston contributes to the force seating the nozzle (adding to the spring that already does that). Because the piston is operated by the opposing force of two levers, this is not possible; the force applied upwards by the pump body lever will exactly equal the downwards force applied by the piston lever (and, through the pressurized metal in the pump cylinder, to the pump body) and so there will be no net force on the pump body.

There was one remaining part of this adjustment that I did this evening: I had to shorten the linkage rod that operates the pump so the idle position of the pump does not quite bottom out the crossheads. This required loosening locknuts at either end of the rod and rotating the rod using a pin wrench in a hole in the middle of the rod. All this done through two openings in the back of the caster not much larger that my hands. The pin wrench is just a little stubby tool which is used to rotate parts such as the mould blade abutment screw (to adjust the width of the type). Unfortunately, the tip of the wrench is quite brittle, and after a couple of turns one of the locknuts bottomed out and the pin wrench snapped off. Both ends of the wrench were now broken so it was pretty much junk, but when it broke off, it just vanished! It fell somewhere under the caster table and so far I’ve been unable to find it. There aren’t many moving parts below the rod I was adjusting so the wrench is unlikely to jam anything, but I’m still impressed at how good a disappearing act it did.

I will probably make my own pin wrench to replace this one (which I got from Rich Hopkins just this summer) and I’ll try to make the tips less brittle, so they bend rather than snap off.

Although I’ve been trying to adjust the nozzle position, I’m wondering if the nozzle alignment (tilt) is off too, and that dragging up one side of the cone hole under the mould is enough to push it into alignment. This would explain why it seals so poorly when it rises freely, but seals better when it is off-center.

I will have to take the mould apart again and clear it of smeared type metal, so while it is off I can check the nozzle alignment. The smeared type metal is partly the result of running the mould too hot (in an effort to stop nozzle freezes).

Sunday evening, I shut off the machine early in my frustration, and spent the rest of the evening patching up the tractor holes on the ribbon. I also repunched the justification codes to correspond to my set size of 10¼ points (the ribbon had originally been punched for 9½ points set). I have a small Excel spreadsheet into which I can enter the original set size, new set size, original line length, and justification punches, and it calculates the new line length and corrected justification punches.

Grimsby Wayzgoose Coming Up on April 26th

The Grimsby Public Art Gallery will be hosting its 36th annual Wayzgoose book arts fair this year on Saturday April 26th, from 9am to 5pm. We will be there selling our paper, marbling, and other supplies. Our friends from the Book Arts Guild of Richmond Hill will be there too along with dozens of other people working in the book arts.

You can find more information as well as directions to get there at the fair’s web site. Grimsby is on the north shore of the Niagara peninsula, about halfway between Hamilton, Ontario and Buffalo, New York.

February 15th Casting Session

In preparation for casting last Saturday, I moved a few mats in the matcase I was using so there would be low quads where the ribbon expected them. The ribbon also expected a 10-unit space to exist, so I placed a blank mat there and will have to live with getting a high space. I also swapped the parentheses to match what the ribbon wants.

I covered one hole in the ribbon to convert an exclamation mark into the space of the same width that should have been punched.

I spliced out the two duplicated lines that were still there, and used some tape to smooth out one of the glued splices made earlier. The roughness of the splice seemed to be causing the wrong matcase position to be cast at the start of the line.

The remaining mistakes seem to be actual keyboarding errors which are to be fixed by replacing sorts in the cast lines.

I took the mould apart (but left the squaring plate in place), cleaned all the mating surfaces of the two type blocks and reassembled them.

I checked my metal temperature with a thermometer and found that the controller was reading about 10°F high.

I also checked the overcurrent protection on the motor power source, which had been tripping every few lines the week before. Everything seemed fine, though.

So I started casting again. It took a while to get past the nozzle freeze stage, and eventually I started to have one of the opposite problems, called “bleeding feet,” where molten metal oozes from the foot of the type after the jet is cut off. This produces a blob of metal which leaves the type too high, and often snagging adjacent type as well. The blobs would also force the type channel open as well, allowing other type in the channel to fall over. Once I slowed the caster down to 135RPM this stopped happening and I seemed to be getting good type. Cleaning the mould definitely helped because reduce the presence of fins on the type.

But then the galley stopped collecting the lines of type, leading to a broken part and two hours wasted.

I was also still getting the motor cutting out on me every 4 or 5 lines, and I still don’t understand why.

ResultI finally got what at first seemed to be a good forme of type finished (albeit a bit pied by the uneven line lengths), but on closer inspection I found many wrong characters cast. The errors were of a very particular type, though: The character cast in error was always directly above the one that should have been cast. My hypothesis is that, with use, the air pins have become looser and need less air to raise them. When a particular row, say 5, is signaled, the 4 and 6 air pins also rise because of leakage between the air channels just under the ribbon. The matcase always picks the row for the smallest number, and in this case that means one row above the right place. If this is the problem I should be able to fix it by turning the air pressure down. If the problem persists next time I’ll try taking a video of the front pin block to see if the rogue pins can be spotted at work.

NozzleI am still getting metal accumulating under the mould, so before the next casting session I will be verifying the nozzle alignment. I found some type metal adhering quite tenaciously to the hole under the mould and wonder if this could be enough to cause the leakage. I managed to get the metal cleaned out of there.

I looked over the nozzle after giving it a good cleaning and it seems fine. I have never had it this clean before, and now I see that the tip of the nozzle appears to be an insert of some other metal than its main body.

 

Misdiagnosis Results in Broken Part

Last Saturday I tried again to do a run of composition casting. At some point, the galley mechanism stopped working, and a very long line developed in the galley.

I stopped casting and looked for the cause of the problem. The justification was still taking place, but when the galley trip rod (a49D) was pushed forward by the justification mechanism it didn’t even touch the galley trip lever.

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On the English casters, this trip lever (h45FF) has a graduated adjustable cam (45F29 through 35) to control how far the trip rod has to move before tripping the galley. This allows the setting to be adjusted to compensate for overthrow of the trip rod when the machine is running fast and a single justification is coded in the ribbon, and also allows the switch between using single and double justification to trip the galley. I couldn’t really understand how this could have gone out of adjustment so easily, but I reset the cam position so double justification would trip the galley again.

I started casting again, and the galley tripped properly this time, but partway through its cycle there was an unexpected clunk. At the next line end, the galley did nothing again even tough I saw the trip lever move.

I stopped the machine right away and removed the tool tray to check the galley mechanism. This is what I found:

Broken

The post (14F6) that the pawl spring should attach to was snapped off. It seems that halfway through the galley cycle, the galley trip lever had caught this post and snapped it off. This implied that the trip lever was capable of swinging much too close to the axis of the galley cam, so the stop bolt (45F9) was also adjusted wrong.

It was only when I had a closer look at the trip lever and its adjusting cam that I realized the true cause of the original problem. The bolt (45F27) that locks the two pieces of the trip lever (h45F and 45F26) together had loosened and the two ends of the lever had swung out of their proper relative positions. You can actually see the clean spot where the washer should be. Because this had shifted the trip lever was able to swing in and catch on the spring post.

The American casters have a one-piece trip lever, and use an adjustment screw (along with a spacer that swings in & out for single- or double-justification galley trip) to accomplish what the fancy cam on the English machines does. The presence of this two-piece trip lever seems somewhat superfluous to the adjustments provided by the cam and stop bolt. Its only reason for being there seems to be so that the trip lever can be set so position A of the adjustment cam reliably trips the galley with single justification at low speeds. This ensures that the adjustment cam has enough range to work with double-justification galley trip at high speeds.

In any case I re-adjusted the trip lever based on the instructions in Monotype Composition Caster Manual (I will have to check this) because Casting Machine Adjustments only refers to the American-style trip lever. Position A of the cam now gives low-speed trip on single justification, and position N (I will have to check this too) gives low-speed trip on double justification. Since I am not using justification changes within the line I would probably not notice if the single justification that forms half of the line end is also tripping the lever due to the caster speed. I also tightened the locknut on the stop bolt, something which I neglected to do previously, as is clear in the first photo.

This left the job of replacing the post. I had good luck on two fronts there. I had a spare post which was easy to find because it was still in its place in the spare galley cam I have. I was also lucky in that the broken stub of the post was loose in its hole, so I could unscrew it by tapping on its just right using a small prick punch.

The replacement post 14F6

The replacement post 14F6

The repaired galley, with a bit of cleaning done as well.

The repaired galley, with a bit of cleaning done as well.

So because I didn’t analyze the original problem properly, I ended up breaking another part. I was fortunate in that replacing it was fairly easy, and even if I did not have a spare on hand I could have made a suitable replacement.

Besides this, I had other problems casting as well, although I also had a couple of improvements from the previous casting session. Details to follow.

Result from Last Weekend’s Casting Run

Despite all the difficulties I encountered in last weekend’s attempt to do some composition casting, I still ended up with some type cast, which I proofed on my Challenge MA15 and annotated:

Form and Annotated Proof

From this it looks like my matcase arrangement isn’t quite what the ribbon expects. In particular there seem to be some characters in positions where the ribbon expects to find low quads. There are also still two re-keyed lines where the original erroneous lines (in this case missing their indent) were not killed. I will splice these two lines out of the ribbon. One lowercase ‘g’ floated into the wrong line because the galley width was set generously to allow for varying line length. There are some other errors that may be due to incorrect compressed air pressure causing the wrong air pins to rise. The parentheses appear to be interchanged in this case as well.

Matcase After CastingThe matrices themselves ended up with a lot of type metal pressed into them. I may be getting a lot of leakage in the seal between the mat and the top of the mould and some of the flash is adhering to the mats.

This weekend I’ll be trying again, and I hope it won’t take all weekend this time!

A Manual Punch for Monotype Ribbons

In the process of patching together the only ribbon I have for my Monotype, some of the holes have been blocked and needed to be re-punched. Furthermore, repairing the edges of the ribbon requires re-punching all the tractor holes. Finally, modifying a ribbon for a new set size can be done by altering the punches that set the justification wedges.

IMG_6917 IMG_6916To do these jobs I made myself a small punch out of steel. It is just a short piece of steel rod with a hole drilled down the middle and the end tapered to form a cutting edge. I started drilling the hole with a #47 drill since this seemed to be the best compromise between the three different hole sizes encountered on a ribbon, but that drill broke. After removing the shattered pieces of the drill bit, I used the next size up (#46) to deepen the hole a bit, then drilled from the back end with a larger drill that was less likely to break. I tapered the end finishing off the job using a file.

At first I was just using this held in my fingers but that got tiring pretty quickly, so I found a way to fit it to a handle. Using a bit of paper I jammed it into a socket which in turn fits onto a screwdriver handle.

IMG_6914Punching holes is a simple matter of pressing this cutter down with the ribbon sitting on a cutting mat. The chaff pushes up through the central hole and comes out the back of the cutter, so occasionally I have to remove it from the handle to clear it out.

This is not hardened steel, so I expect it to dull quickly, but sharpening it is easily done on the lathe.

Monotype Display Mat Storage

The question came up recently on the Typecasting mailing list as to the best way of storing American-style display mats. These originally came in boxes with a slotted wood insert and a covering made of heavy cardboard covered with faux-leather cloth. The cloth provided hinges for a flip-over cover which was held closed by a pair of snap fasteners.

With age the cloth and paste have deteriorated and most of these boxes are crumbling, although one occasionally finds a few in good condition. Besides disintegrating with age, these boxes also occupy a lot of space, as each font of mats 3.5 ×8×22cm (about 1½×3¼×9 inches).

The storage system I use is pretty much the same as the one used by Rich Hopkins. Each set of 5 sizes in a single face is stored in one polyethylene box with a hinged lid. This particular box, a Flambeau V501 with home-made partitions, is pretty much the ideal size, as long as the partitions are not too thick. The box outside dimensions are 25.5×10.8×3.8cm (10×4¼×1½ inches), so stored mats only use about one third the volume (assuming you have most of the sizes of most of the faces).

At the time I bought them (early 2009) I paid $3.82 each for 48 of them. With shipping and currency conversion they ended up costing me CAD6.40 each—the Canadian dollar was really in the dumps back then. Now their web site lists them at $4.04 each in unit quantities. They don’t mention any discount for full cases but it probably wouldn’t hurt to ask…

1 - PartsI used sheet aluminum (some 0.025″ and some 0.032″) to make the partitions, cut to size using a shear and notched using a slitting saw. This notching was a tedious process and although the accurate slot widths look pretty they aren’t really very useful. I could have spent a tenth the time just using my bandsaw to cut the slots.

By the way, the double slots at the bottom of the five long piece are a cutting mistake.

Rich used reglets and thin leads for his partitions, cutting the slots on his Hammond saw. I believe he also had a different arrangement of the horizontal partitions.

2 - Grid AssembledAssembling this grid is something that would also have gone faster with wider slots. Once the box is full of mats the extra slop would not show anyway.

The tricky part at this point is picking up the assembly without letting any of the pieces drop out.

I tried assembling them in place in the box but that was harder than assembling them outside and lifting the assembled dividers.

I picked this partition layout partly so that there would be horizontal dividers near either end of the long vertical dividers to give them lateral support.

 

3 - Grid in BoxOnce the grid of partitions is placed in the box it looks like this.

Because the width is such a tight fit the rightmost vertical strip is actually interrupted to span over the inset area around the cover latch.

Because the leads Rich used were thinner than the aluminum I used he was able to have five full-height vertical dividers.

 

 

 

4 - FilledOnce the box is filled it looks like this. A full box of brass mats weighs a little over 4kg (a little under 9 pounds). Naturally, boxes containing aluminum mats or missing sizes will weigh less.

This was one of the boxes I filled early on when I was ambitious enough to write the sizes and line standards inside the cover.

There is also a bit of room along the right side of the box for a few more mats or other stuff.

 

From top to bottom the compartments contain:

  • Line standard and/or reference sample cap H
  • Miscellaneous non-letters
  • Standard points (plus & and $)
  • Figures (without $)
  • Uppercase alphabet
  • Lowercase alphabet
  • Miscellaneous letters (ligatures and alternate forms)

There is also room on the inside of the cover for other notes about the face as needed.

I find a couple of minor disadvantages in this storage system:

One is that picking out a particular mat, especially an alphabetic one, requires a lot of counting or good guesstimation. I am strongly tempted to use my mill to engrave the letter on the top edge of each mat.

Another is that I think I made the dividers a bit tall, making it harder than it should be to lift out a mat.

As well, the dividers are loose in the box and if they work up it makes pulling a mat even harder. With a full box of brass mats the dividers can work up quite easily as the box flexes in handling under the weight of the mats.

If I were to make up more of these (and it looks like I’ll have to soon, since I’m out of boxes but still have mats to store) I would make the dividers narrower, and somehow arrange that they bit into the box sides (perhaps heat them so they melt into the plastic a bit?). I would also forego the nice accurate slots and just use my bandsaw to cut them.

The boxes can be stored on shelving or a galley cabinet (although only every second slot can be used because of their height). I happen to have a chest of small drawers where each drawer has room for one of these boxes and several matcases should I be so lucky as to find composition mats for the same faces I have in display sizes. The drawers are unfortunately not large enough to hold two of these boxes so I’m not sure what I will do for faces that have many alternates (e.g. a large set of swash caps) or come in other display sizes (such as 12 point).

 

 

 

Composition Casting Followup: Type Carrier Repair

While trying to do some composition casting last weekend I found that an internal part of my type carrier was broken, so I had to give this part a quick servicing.

There aren’t actually that many internal parts to deal with, but they go together in a non-obvious manner and if you were not paying careful attention during disassembly you’ll spend forever putting the carrier back together again.

So here is a step-by-step disassembly of the type clamp and type support spring.

Step 1

This shows the type carrier with the back facing up and the top towards the camera. The linkage rods are out of view to the left and were not involved in this procedure.

The first part to remove is the cover, officially called the Type Clamp Shoe. It is held on by three small screws, and has a tang which compresses a spring located under its left end. As you remove the cover be careful to allow the spring to extend in a controlled manner so you don’t lose it. This cover is quite a close fit in its recess so you may have to use a thin knife to lift it out. Start lifting at the right-hand end.

Step 2

With the shoe off, most of the internal parts are at least partly visible. The type clamp is held closed by its spring a26B2 which in turn was compressed by the tang at the left end of the shoe. The Type Support Spring runs mostly under the Type Clamp but there is a small protrusion on the Type Clamp which is behind the Type Support Spring. This protrusion is what the lever presses against to open the clamp.

To remove the Type Clamp, use your left hand to gently hold the Type Support Spring and its associated parts in place while you use your right hand to lift out the Type Clamp. The support spring will start to come up with the clamp, but once the clamp is completely out of its groove it can be pivoted up and twisted to release it from the type support spring. The Type Clamp Spring and its guide rod should be removed if they did not come out with the clamp.

Step 3

The Type Support Spring and its Bar Yoke are tenuously attached to each other but it should be possible to remove them as a single unit by just lifting them out.

Step 4

These parts are only held together by a small contact area. If this spot is worn and no longer has nice sharp corners, the pieces will tend to fall apart and, if you are not careful, may shoot across the room. The Type Support Spring is moved back and forth by the lug on the lever engaging in the spot as marked by the dashed arrow.

Step 5

The Type Support Spring comes apart into the parts shown above. When assembled, the left end of f31B1 snags on the boss on c31B4 and is held against this by pressure from the spring. In use, if something is blocking the support spring from advancing towards the end of the type carrier, the spring compresses and only c31B4 moves.

IMG_6895This shows the two damaged parts in my type carrier, with new (or perhaps like-new) replacements above them.

The prongs on the type clamp are splayed outwards and (although it does not show in the photo) also bent back.

The end of the type support spring is still bent out of shape, despite my attempts to straighten it, and is also missing its tip.

After cleaning all the parts, I reassembled the type carrier with the new type support spring, but I was unable to get the new type clamp to move smoothly so I bent the prongs on the old one back into shape as best I could and re-installed it.

I have two or three other type carriers in my spares so I may try mixing and matching type clamps to see how their fit varies. The parts manual does not contain anything implying that these would need to be specially fitted.

Once I reinstalled the repaired type carrier in my caster all the type started arriving in the type channel oriented correctly—no more sideways spaces! Unfortunately I still don’t know what actually happened to damage the support spring in the first place, and I only have a few more spares.

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