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Jobs

making a gear segment from a drawing from long, long ago

making a gear segment from a drawing from long, long ago

(OP)
A customer needs a new segment gear for a device designed in the 30s and 40s, and built in the 1970s.

Attached is an image showing the OEM drawings for the gear and worm.

A local shop said could make the gear if they had a step or dxf file of the parts.

Is it possible a "real" gear shop be able to work with the gear descriptions/dimensions directly?

thanks,

Dan T

RE: making a gear segment from a drawing from long, long ago

It depends.
First thing to work out is if you're working with a throated gear or a spur/helical gear.

RE: making a gear segment from a drawing from long, long ago

(OP)
And the shaft bracket center-to-center is 1/16 " greater than the 4.25 C-C the pitch diameters would call for. That would provide a bunch of backlash and tip clearance and etc, , I suspect, so binding even with the most basic gear would be unlikely

RE: making a gear segment from a drawing from long, long ago

(OP)


yep. very similar, but a Different part. Did Google squeal on me?

I think it may be the same shop this time, because I think I heard 3rd hand that they thought they'd made one (somehow) for us before, but realized this one is different, so are looking for cad info.

RE: making a gear segment from a drawing from long, long ago

2

Quote (Tmoose)

Did Google squeal on me?
No, I just happened to recognise the gear data............which appears to be exactly the same as all the info we gave you in the previous thread.

RE: making a gear segment from a drawing from long, long ago

In answer to your original question; yes, a gear shop will be able to make a set for you based on the info you've provided.

RE: making a gear segment from a drawing from long, long ago

(OP)
Thanks gearcutter. I just reminded purchasing we had the same gear segment made last year, presumably successfully.

I'm sorry I did not check deeper. The reported 3rd hand story that they thought they'd made a segment (somehow) for us before, but realized this one is different, must have a different interpretation than the one I assumed.

RE: making a gear segment from a drawing from long, long ago

agree with Gearcutter, shop can make it. the worm is easy, thread cut , thread grind or hob., the worm gear requires a worm to be used as a master to set the correct pattern and center distance. and a hob (based on the worm) will cut it.

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