SB 9C 80T idler gear

[malleusmagnus]

I am in need of the 80T idler (the Ø5/8 smooth bore, not the keyed leadscrew gear). I would apprecaite any leads.

 

[MrWhoopee]

Here's what I got for my Heavy 10 when building my transposing gear, not sure if the 9 is the same, but it's a place to start. Some modifications may be required.

Boston Gear GB80B Spur Gear, 14.5 Degree Pressure Angle, Cast Iron, Inch, 16 Pitch, Bore, 1.625" OD, 80 Teeth: Amazon.com: Industrial & Scientific

Boston Gear GB80B Spur Gear, 14.5 Degree Pressure Angle, Cast Iron, Inch, 16 Pitch, Bore, 1.625" OD, 80 Teeth: Amazon.com: Industrial & Scientific

www.amazon.com

 

[malleusmagnus]

Thanks, but the 9" gearset is 18DP; that pitch is not commercially available, unlike the 16DP and 20DP gears. In order to use commercial gears, I'd have to scrap my entire change gear set.

 

[RandyWilson]

SOUTH BEND 9/10K METAL LATHE METRIC TRANSPOSING CHANGE GEAR 80/63 3d Printed | eBay

(Your existing gear it replaces should be 80 also but does not have to be.). The traditional pair of transposing gears have 127 and 100 teeth. The rest of the gear train simply multiplies or divides that new pitch value to get to the desired pitch.

www.ebay.com

Maybe? Use the 80T straight through rather than the transposing step-down.

 

[MrWhoopee]

Maybe? Use the 80T straight through rather than the transposing step-down.

2 birds! I have an 80/63 transposing set. It lives on the lathe full-time. I use the 80 as an idler for general use and inch threading, turn it over and readjust the banjo for metric threading.

 

[malleusmagnus]

SOUTH BEND 9/10K METAL LATHE METRIC TRANSPOSING CHANGE GEAR 80/63 3d Printed | eBay

(Your existing gear it replaces should be 80 also but does not have to be.). The traditional pair of transposing gears have 127 and 100 teeth. The rest of the gear train simply multiplies or divides that new pitch value to get to the desired pitch.

www.ebay.com

Maybe? Use the 80T straight through rather than the transposing step-down.

That would be an option, if I had one.

 

[MrWhoopee]

That would be an option, if I had one.

I believe Randy was suggesting you buy the transposing set in the link and use the 80t as the idler without engaging the 63t.

 

[malleusmagnus]

Ah. that makes more sense; I missed the connnection between the link and the comment. I appreciate the suggestion, but I was asctually trying to stay away from plastic gears. If I knew for sure what the material was, I might be more comfortable with it, but it just seems like too much of a crap shoot.