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Change gears for Smithy 3-in-1 AT-300

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caster

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I broke a change gear for my Smithy 3-in-1 AT-300. I am looking to replace or fabricate a new gear but I don't know what the gear bore is called. Its a metric gear 1 mod 63 tooth, the bore is 15mm but it has 4 keyways at right angles that measure 4.75 mm wide (my 3/16 broach fits perfectly) by 1.5mm deep. Can anyone identify what type bore this might be?


Thanks in advance for your help,

Caster

change gear1.jpg

I posted this question to the questions & answers forum, here is the link

http://www.hobby-machinist.com/showthread.php/30642-Need-help-identifying-gear-hub?p=265547#post265547

change gear1.jpg
 
Last edited:

brent.m.bowen

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You can call Smithy and give them the number stamped on the gear, they are fairly cheap. I had to get 3 for mine a few months ago, they are very helpful.

Sent from my SM-N910V using Tapatalk
 

wa5cab

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Getting parts from the OEM is usually a good idea. For one thing, if they are still in business, it helps to keep them in business. :cool:

I don't know that there is a formal name for this bore. The Atlas gears have two keyways @ 180 deg and most of us seem to call that "double keyed". So I guess that "quad keyed" would be appropriate.
 

COMachinist

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I rescued a AT300 from the scrap yard, and found some of the change gears. They don’t even look used. PM me what you need ie size and teeth count and I look to see if I found the one you need. I have most of the ways, the tail stock, a cross slide tool post. I think the motor is shoot, pulleys, mill spindle don’t know about it. Got the 3 jaw 5” chuck looks like it is in ok shape as well. If anyone needs parts let me know.
CH
 

CNCTOOLEXPRESS

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I broke a change gear for my Smithy 3-in-1 AT-300. I am looking to replace or fabricate a new gear but I don't know what the gear bore is called. Its a metric gear 1 mod 63 tooth, the bore is 15mm but it has 4 keyways at right angles that measure 4.75 mm wide (my 3/16 broach fits perfectly) by 1.5mm deep. Can anyone identify what type bore this might be?


Thanks in advance for your help,

Caster

View attachment 91519

I posted this question to the questions & answers forum, here is the link

http://www.hobby-machinist.com/showthread.php/30642-Need-help-identifying-gear-hub?p=265547#post265547

View attachment 91519
We have a large selection of these gears of various sizes www.cnctoolexpress.com
 
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