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Unread 28-04-2015, 23:17
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Re: AndyMark Parts Feedback 2015

We ran into a couple of issues with AM parts this year. First off was shearing off the output shaft of the PG-188 when back driving it. That was not expected at all. We ended up taking off the PG-188 in the end anyway. Second was having an issue with the AM Planetary gearbox. The shaft was undersized by a few thousands (we mic'd it out). It looks as if it was made to 5/16 rather than 8mm, so the press fit gear we were using was slipping on the shaft. We tried knurling the shaft, and that seemed to work, but we eventually replaced it with a MiniCIM after finding some weight because we were unsure about how long the knurl would last.

The tough boxes worked great. We CNCed a new face plate out of .050 2024-T3 to lighten them up a bit and that worked a treat. We also used a couple of 32dp gears from AndyMark, and we didn't have any issues with them, so that's a plus.

Last edited by Michael Hill : 28-04-2015 at 23:24.
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Unread 28-04-2015, 23:23
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Re: AndyMark Parts Feedback 2015

Quote:
Originally Posted by Michael Hill View Post
We ran into a couple of issues with AM parts this year. First off was shearing off the output shaft of the PG-188 when back driving it. That was not expected at all.
Had this problem last year when we used two of them, direct-driven, to actuate our roller arm (after both failed as described, we switched to pneumatics). If you look at the spec sheet, it actually does specify that this is the standard failure mode if you exceed the maximum rated torque - I was surprised, too, until I looked it up.
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Unread 28-04-2015, 23:26
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Re: AndyMark Parts Feedback 2015

Quote:
Originally Posted by Oblarg View Post
Had this problem last year when we used two of them, direct-driven, to actuate our roller arm (after both failed as described, we switched to pneumatics). If you look at the spec sheet, it actually does specify that this is the standard failure mode if you exceed the maximum rated torque - I was surprised, too, until I looked it up.
If you open up the PG-188 gearbox, the shaft has a couple of triangular notches in them. That's where ours broke. I'm not sure if they're put there to create a known failure mode or not. If so, I'm guessing the thinking is that it's relatively simple and cheap to replace the shaft rather than the gear assembly.
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Unread 28-04-2015, 23:31
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Re: AndyMark Parts Feedback 2015

Quote:
Originally Posted by Michael Hill View Post
If you open up the PG-188 gearbox, the shaft has a couple of triangular notches in them. That's where ours broke. I'm not sure if they're put there to create a known failure mode or not. If so, I'm guessing the thinking is that it's relatively simple and cheap to replace the shaft rather than the gear assembly.
That was my guess, too, though if this is the case the fact that AndyMark doesn't seem to sell the output shaft separately on their website is a bit of a headscratcher.
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Unread 28-04-2015, 23:48
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Re: AndyMark Parts Feedback 2015

Quote:
Originally Posted by Oblarg View Post
That was my guess, too, though if this is the case the fact that AndyMark doesn't seem to sell the output shaft separately on their website is a bit of a headscratcher.
You might be able to buy it if you call them up.
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Unread 29-04-2015, 00:40
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Re: AndyMark Parts Feedback 2015

On the Nanobox there is inadequate clearance between the upper mounting hole location and the installed CIM motor. The 10-24 cap head bolts heads pushed the CIM down making for a very loud or binding gearbox. We had to machine down the OD of the bolt heads on a lathe to make these gearboxes usable. We used four of these per robot for our Mecanum drive.
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Unread 29-04-2015, 00:52
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Re: AndyMark Parts Feedback 2015

We had huge successes with AndyMark this year.

We ended up using 5, 6" Aluminum Dualie Omni wheels. They worked perfectly all season except for one point during practice where the bolts keeping the wheel together fell out. It was easily fixed with some thread locker.

We used the kit bot chassis this year and modified it to be an H-Drive. We found it incredibly simple to make this modification, we just ordered a third inner side plate and an additional Toughbox Mini. We created four gusset plates to hold the center plate on the robot and had the "H" of our drive installed by the end of week 2. Worked great all season too.

Our least favorite AndyMark product of the season was the Stackerbox Double. It worked really well once we fully assembled it for use but it was a little difficult to modify the gearbox to work with a CIM motor. Overall, we found the documentation for the gearbox to be somewhat lacking. Would be super helpful if there was a document outlining the method to drive this directly with a CIM motor!

I know the team loves AndyMark, we bought a few non-AndyMark products this year and only ran into issues. The students are really happy with the quality that AndyMark brings to the table.
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Unread 29-04-2015, 13:21
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Re: AndyMark Parts Feedback 2015

We ran a raw box this year with a custom output shaft--no complaints, worked through every competition. 2 CIMs through VP's were input into the transmission.

We stripped the worm and worm gear on our practice robot's gearbox at one point, but we believe we assembled that one wrong and we were lifting 8 totes with a >5 ft lever arm with a 6:1 reduction against the gearbox (stress testing). So, the load rating seems pretty accurate.

We would certainly use it again.
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Unread 29-04-2015, 13:35
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Re: AndyMark Parts Feedback 2015

We used tons of AndyMark stuff this year. My only complaint was the shaft adapter to take the gear-motor shaft (10mm?) to half inch to drive a chain sprocket. We broke two...usually in match, rendering our lift inoperative. It would be nice to have a steel version...or better yet - make all the gear-motors have 1/2 hex shafts.

EDIT: Thought of another thing...The recesses for screw heads on the plastic belt pulley halves are too tight to get any kind of socket tool around the head - and the screws get too tight to drive with a slotted screwdriver.
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Last edited by Qbot2640 : 29-04-2015 at 13:47.
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Unread 28-04-2015, 23:32
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Re: AndyMark Parts Feedback 2015

Our lift mechanism was powered by a Raw Box in order to prevent backdriving. With the Talons for the two motors (Rs-775's with CIM-ilies) set to brake mode, no additional current was required to prevent a six tote stack with bin and noodle from backdriving the motors.

We did have one issue, however, with the holes for mounting the motors. Both of our Raw Boxes required us to drill out the mounting holes to get the screw to actually line up with the threaded holes on all of our CIMs. Once we drilled them out to a larger diameter it worked fine, but perhaps this is an issue due to the holes being drilled before bending the sheet metal?
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