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Test Jig from Clockathon #2 - FIXED

by syvwlch, published

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Test Jig from Clockathon #2 - FIXED by syvwlch Feb 6, 2012

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Description

UPDATE:
Fixed a bug on the hour gear. Download the fixed STL and if you are interested in it, all three OpenSCAD files as well.
UPDATE

This is a cleaned up version of the printed clock we were able to make during Clockathon #2 last weekend. Thank you Makerbot and Bre for setting that up and hosting it, and thank you Ben for all the help, the awesome test print all set up, and the brilliant idea to back off one gear for the power drum.

It was ticking, powered by a weight that would only drop about 9" per twelve hour period, and included printed concentric shafts to support minute and hour hands on the face of the clock.

Here's some video: youtube.com/watch?v=AH4Tg2tIgfg
I had to inflict grievous harm to the code base at the time and have cleaned everything up since. See details below.

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If there's a way to send you a private note I haven't figured it out yet. (I only came to thingiverse the first time yesterday.)

Your early designs are simple enough to guess (either from the text or the gif's) that you were thinking of using a 60:1 ratio of minutes to hours. I would have expected 12:1 to be required but I don't see a specific mention in the later evolutions. If 60:1 is indeed correct, can you take a moment to explain how that works?

When we finalize the design, we'll have a complete set with labelled parts and a case to print. Meanwhile, it's still a little beta. ;-)

Not hard at all, but as we don't have a printed case and the parts aren't numbered or labelled, it still takes a little extra DIY. Mostly we've been mounting everything on a board, with a printed box to hold up the shafts.

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Instructions

From the makerbot clockmaker google group:

So I cleaned up the code from clockathon 2, and implemented the changes discussed.
1. Changed the gearing to add another factor of two to account for the fifteen tooth escapement wheel. Still six gears total.
2. Deprecated the old drumgear routine that could only be used on the front of the clock and replaced it with the core pinion wheel routine, which can now include a non ratcheting drum on any gear, and can now produce a gear with no pinion if you set the number of teeth on the pinion to zero.
3. Implemented some logic to use one shaft radius (bearingRadius) if the gear has no concentric shaft, and another (pinRadius) if it does. This way, the design automatically assumes you place bearings on all the gears that do not include a concentric shaft.
4. Changed the parameters to include concentric shafts and hands for the hour gear and the minute gear.

With these changes, it is now possible to generate the same clock we had at the end of clockathon 2, without touching the code or the parameters incessantly. What it currently does NOT do is include a ratcheting drum solution for any other gear than the front one, or a way to turn the fixed drum on for only one gear (right now, you just turn it on while rendering the gear(s) you want with drums, and turn it off for the rest).

The standard config right now is bearings on all gears except hours and minutes, concentric printed shafts resting directly on M5 threaded rod (had to guess at a good radius value there) for the two exceptions, and a 5mm wide non-ratcheting drum on the gear between hours and minutes.

Today's respite from business travel does not extend to tomorrow, unfortunately, so I will post this code base later today, with some STLs and some screen grabs... And you guys can give it a spin. Ha! See what I did there? ;-)

Comments

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SwissFrank on Jan 15, 2013 said:

If there's a way to send you a private note I haven't figured it out yet. (I only came to thingiverse the first time yesterday.)

Your early designs are simple enough to guess (either from the text or the gif's) that you were thinking of using a 60:1 ratio of minutes to hours. I would have expected 12:1 to be required but I don't see a specific mention in the later evolutions. If 60:1 is indeed correct, can you take a moment to explain how that works?

Jeannine on Feb 26, 2012 said:

I cannot tell you how long I have been looking for a mechanical clock to 3D print ot laser cut that actually works that my students and I can use to learn how a clock works...how difficult is this to assemble once parts are printed?

syvwlch on Feb 26, 2012 said:

Not hard at all, but as we don't have a printed case and the parts aren't numbered or labelled, it still takes a little extra DIY. Mostly we've been mounting everything on a board, with a printed box to hold up the shafts.

Surveyor on Feb 12, 2012 said:

Have you found a bearing that works? I've been browsing my bearing catalogs but an 8mm OD 5mm ID bearing is mighty rare.

syvwlch on Feb 12, 2012 said:

We switched to those bearings when Ben opted for M5 rod, the M3 having a tendency to bend under the weight on the drum. Ben found these bearings and we haven't looked back... Although we are thinking of standardizing to something easier to find.

I've asked Ben, and the rest of the merry crew on the Makerbot clock maker google group, for the source of these bearings. They should get back to us soon. If you want to drop in and say hi, join the group at http://groups.google.com/group... .

Alternatively, we could branch th
e clock and have a different version with different hardware... But since it takes time to generate the STLs, it might lag a bit behind on the bleeding edge.

syvwlch on Feb 12, 2012 said:

Published a ratcheting replacement for part #2, the intermediate gear that carries the drum powering the clock. Should make it easier to rewind the clock without taking it apart.

http://www.thingiverse.com/thi...

syvwlch on Feb 12, 2012 said:

And... already published a fix for the replacement part. Sorry about that guys...

Surveyor on Feb 12, 2012 said:

The hole in the escape wheel doesn't go all the way through. I'm assuming it's supposed to??

syvwlch on Feb 12, 2012 said:

lol

Yes, it should go all the way thru. I'll take a look at the code, fix it and republish the STL. In the mean time, since that part rides on bearings and the blockage is halfway down the hole, you can probably just drill a hole for the shaft, put bearings on either side and call it a day. :-)

Surveyor on Feb 11, 2012 said:

Is there a need for the thin little shoulder on the bottom of the Hour Gear? It means I have to print with support, and makes a lot more cleanup. Thanks.

syvwlch on Feb 11, 2012 said:

Hum... There's something wrong with that part. There shouldn't be that cylinder sticking out the bottom and the hole should go all the way thru. Must be something wrong with my code in OpenSCAD.

I'll rerender the hour gear and post a new STL. Sorry about that!

Daid on Feb 9, 2012 said:

Silly questions time!

I don't see any place to attach the weight to the clock when I render it in OpenSCAD? I'm guessing it has to do with some setting that you need to enable for the escapement wheel?

I guess the biggest challange was getting the escapement to work right and reliabily?

syvwlch on Feb 9, 2012 said:

No such thing as a silly question. :-)

The weight driving the clock goes on a string wound on the drum built into gear number 2, between hour and minute gears. There is a series of holes in the side of the drum to tie off the string.

The pendulum weight needs to be added to the stub sticking out of the escapement (not the escapement w
heel), on the end of something long and thin like threaded rod or a ruler.

Daid on Feb 7, 2012 said:

This is one of the more awesome projects on Thingiverse. Great job. I see you had to stick a few bearing in it? I guess it has to much friction without bearings?

syvwlch on Feb 7, 2012 said:

Actually, we're starting to think that, except for the drum holding the weight that powers the clock, radial loads are low enough that bearings aren't strictly necessary... But they do prevent wear, eliminate some slop and eliminated friction as a variable during the testing.

We may publish a no-bearings version once the clock is finished!

Surveyor on Feb 7, 2012 said:

I've been watching the progress of this keenly. This is the first iteration that I've downloaded and plan on printing. Is there not parts number 8
&
amp; 9?

Keep up the good work!

syvwlch on Feb 7, 2012 said:

The part numbering scheme stems from the way the script is written, with the possibility of using zero to eight gears between the escapement and the drum. This version only uses six, so two numbers don't get used.

Make sure you have access to some M5 threaded rod and some bearings that fit on it with an outer diameter of 8mm... Before you print these out. Or some plan to make due without, in true maker fashion!

Greymantalker on Feb 7, 2012 said:

Once cleaned up... any chance of also posting DXF files for us Laser folk? I know it

would be a bit... but the 3D AND Laser communities would both benefit..

Thx..

syvwlch on Feb 7, 2012 said:

Hum... That would be an interesting challenge! Since we're not using the herringbone gears, it should be possible by stacking cuts, but it would require quite a bit of rework and redesign, I would think.

A stopgap would be to extract dxf slices from the existing STLs, which I believe is not that hard to do in OpenSCAD or can be done by hand in something like Sketchup.

rustedrobot on Feb 7, 2012 said:

Arg! Of all the bearings and threaded rod I do have, 5mm isn't it for either!

bfraser on Feb 7, 2012 said:

Agh, sorry! I now have a bunch of it. You should be able to get by fine with anything else though. Try not to go much smaller on the bearing OD as there are great benefits from the larger higher quality home made on the bot.

syvwlch on Feb 7, 2012 said:

Change two parameters, pinRadius and bearingRadius, to whatever you have, and re-run the scad script once per part, and you should be golden.

syvwlch on Feb 7, 2012 said:

I'm gonna wait a little longer to update the library on GitHub, as things are still pretty fluid with Ben and RustedRobot working on various enhancements.

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