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I think somewhere I heard of plasma polishing (no relation) that's supposed to be absolutely ridiculous. I saw an AEG cylinder that marketed that and I thought it was fake, but I guess it's a real thing and is super awesome.
When I think plasma I think "can't be tight if it's a liquid", so... hm, must be very very carefully done (waiting on EDM* cut cylinders chromed for Ultimate levels of WHAT)

*technichially I think that actually counts as plasma cutting/polishing
 

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Discussion Starter · #30 ·
OK, I am getting your address, and having you do my shimming and motor alignment from now on!

Thats a very good job!
Thank you Sir--unfortunately I only do work locally, as the stuff I build does occasionally still make me curse my own stupidity as I replace parts. When I quit making mistakes i'll start doing tech work. ;)
 

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Thank you Sir--unfortunately I only do work locally, as the stuff I build does occasionally still make me curse my own stupidity as I replace parts. When I quit making mistakes i'll start doing tech work. ;)
Tell me what you think of this idea I have to find better shimming鈥.

Fine some means to measure the space between each side of a gears bushings , clay maybe? Close the gearbox up, including screwing it tight.Reopen the gearbox, measure the thickness of the clay, then do the math between the base of the gears axle shafts, where the shaft meets the bushing, the do math.

Do you think that would work?
 

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Tell me what you think of this idea I have to find better shimming鈥.

Fine some means to measure the space between each side of a gears bushings , clay maybe? Close the gearbox up, including screwing it tight.Reopen the gearbox, measure the thickness of the clay, then do the math between the base of the gears axle shafts, where the shaft meets the bushing, the do math.

Do you think that would work?

Or if you have a 3d printer, you can print one that uses m3 screws (which are the same OD as gear axels, so it self alligns).

They don't work all that well though (or at least my printed version didn't), inconsistencies in measuring mean you still end up playing with shims to get it proper.
 

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Discussion Starter · #34 ·
Tell me what you think of this idea I have to find better shimming鈥.

Fine some means to measure the space between each side of a gears bushings , clay maybe? Close the gearbox up, including screwing it tight.Reopen the gearbox, measure the thickness of the clay, then do the math between the base of the gears axle shafts, where the shaft meets the bushing, the do math.

Do you think that would work?
For bushings, very possibly. You'd still have to tune the gears to each other, but that could save some time overall. I will say, as you get better and better at shimming it gets faster and faster. I can do a pretty good job in under 15 minutes, though I go slower usually.

For bearings, the issue is that they actually have some play to them, so perfect shimming is much harder to determine.
 

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Discussion Starter · #35 ·

Or if you have a 3d printer, you can print one that uses m3 screws (which are the same OD as gear axels, so it self alligns).

They don't work all that well though (or at least my printed version didn't), inconsistencies in measuring mean you still end up playing with shims to get it proper.
I feel like that's a bit of a gimmicky tool. My biggest question would be what gearbox did they test that on? Lots of gearboxes have very slightly different specs to the bushing holes.

I'll also bring up that it become useless if you're using any mixture of different bushings and bearings, as I often do.
 

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Whamhammer, back in my previous life, there used to be a type of specialized 'clay-thread' (not made of clay but that helps the explanation) that was sold to be used for measuring the clearance around bearings in car engines, where the connecting rods bolted onto the crank and the main crank journals as well. You would lay a short piece of this "thread" in the bearing main-cap, torque it down, and then un-torque it, remove the thread and compare the width to a chart printed on the package. So much width from the crush means so much clearance, etc. Harder to explain than I thought it would be but maybe that could be used.
I just found it...it's called "Plastigage"
 
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