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Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 20 January 2010, 09:09
Replies: 37
Views: 46,861
Posted By Gerald D
ShopBot uses thousands of geared Oriental Motor...

ShopBot uses thousands of geared Oriental Motor drives and have enough buying power to have a "custom" gearbox on their motors. They get the TH (taper hobbed) gearboxes which are not available to us...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 20 January 2010, 08:46
Replies: 37
Views: 46,861
Posted By Gerald D
The couple of reports trickling in where the...

The couple of reports trickling in where the Oriental Motor PK296A2A-SG7.2 gearboxes have developed excessive backlash is a bit worrying. Seems like they wear, or bed down, when used under heavy...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 19 January 2010, 20:19
Replies: 37
Views: 46,861
Posted By Gerald D
We have found that the most common source of...

We have found that the most common source of "backlash" seen in the x and y direction is caused by a loose z-slide. The z-slide roller eccentrics should be adjusted up to hold a pre-load on the...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 29 April 2009, 11:24
Replies: 37
Views: 46,861
Posted By Gerald D
Okay, I can see how you see that. Just for...

Okay, I can see how you see that.

Just for fun, put your laser back in the same place and then push/pull the router collet with 2 fingers without any motors running . . . . . . how much...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 29 April 2009, 02:21
Replies: 37
Views: 46,861
Posted By Gerald D
Not even bragging about your eyesight?...

Not even bragging about your eyesight? :rolleyes::D
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 28 April 2009, 23:46
Replies: 37
Views: 46,861
Posted By Gerald D
Chopper, I only once measured a new motor and got...

Chopper, I only once measured a new motor and got 5 thousands. Your motors are obviously no longer new, and your results are useful for the rest of us. Thanks.

Belt drives certainly have their...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 17 July 2008, 20:53
Replies: 37
Views: 46,861
Posted By Gerald D
You can be sure that actual machine flex also had...

You can be sure that actual machine flex also had something to do with the variability in the results. All machines do flex - that is just the nature of metal, or any material for that matter. For...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 17 July 2008, 10:04
Replies: 37
Views: 46,861
Posted By Gerald D
JR, your experiment idea definitely has merit. We...

JR, your experiment idea definitely has merit. We need to define a standard test piece and supply a standard cut file (inch & millimeter) for folk simply to test their machines in general, not only...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 17 July 2008, 09:58
Replies: 37
Views: 46,861
Posted By Gerald D
Yes, Mach3 can compensate for backlash to some...

Yes, Mach3 can compensate for backlash to some extent, but I don't know of anyone using this feature for router work.

Just realise that 0.13mm [.005"] is a tiny amount in the bigger scale of...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 17 July 2008, 04:17
Replies: 37
Views: 46,861
Posted By Gerald D
Not at all. No belt drive will give you 7.2...

Not at all.

No belt drive will give you 7.2 to 1 resolution. No belt belt drive will cost you under the maybe $100 premium you spend at OM to get a motor plus gearbox.

What the OM gearbox...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 13 July 2008, 10:41
Replies: 37
Views: 46,861
Posted By Gerald D
To clarify; OM have gearboxes with a...

To clarify; OM have gearboxes with a spring-loaded taper gear to reduce backlash. For standard production, these gearboxes are supplied with their Alpha-Step series motors, and not with the plain...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 13 July 2008, 04:19
Replies: 37
Views: 46,861
Posted By Gerald D
Backlash in the gearhead of the Oriental Motor PK296A2A-SG7.2

Backlash in the gearhead of a new Oriental Motor PK296A2A-SG7.2 was measured today at 0.43 degrees. On a machine with 30 tooth DP20 pinions, that will be about 0.005" (For the metric people with 36...
Showing results 1 to 12 of 12

 
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