Cutting worm thread on #12

[Pauldarby1]

When my #12 is rebuilt I need to cut a 10tpi worm on a shaft. I have a VN 10" horizontal swivel dividing head. I want to use this, driven by the table feed gearbox. Unfortunately I don't have any of the gears for this. Does anyone one have the set of gears and brackets that they don't use and are willing to sell? I know there is a 'Wanted' section on the forum, but as it's a Van Norman specific part I thought I would ask here as well.

Paul

 

[Pauldarby1]

Looks like I'll have cut a set of gears. Can anyone help with the diameter of the gears?
There appears to be 10 gears as follows:
100, 86, 72, 64, 56, 48, 40, 32, 28 and 24 tooth

 

[herbet999]

Paul,I have van norman #2 that I just got. I think it's close to a #10. If there's any measurements I can get for you, just let me know. Here is a link to the thread with some pictures of my machine

http://www.hobby-machinist.com/showthread.php/26797-Van-Norman-Parts-Machine

 

[chuckorlando]

All the info you need to cut them gears is in the machinist handbook. You got the tpi and the tooth count.

Looks like I'll have cut a set of gears. Can anyone help with the diameter of the gears?
There appears to be 10 gears as follows:
100, 86, 72, 64, 56, 48, 40, 32, 28 and 24 tooth

 

[Cal Haines]

Looks like I'll have cut a set of gears. Can anyone help with the diameter of the gears?
There appears to be 10 gears as follows:
100, 86, 72, 64, 56, 48, 40, 32, 28 and 24 tooth

IIRC, the gears are either 14 or 16 pitch, 14.5 degree pressure angle. However, it doesn't matter what pitch or pressure angle you use as long as they are all the same. I would check for stock gears from McMaster-Carr or Boston Gear and machine them to suit. McMaster seems to have most of the smaller gears. Misumi can machine all but the 86-tooth gear on-demand in about 2 weeks; these would be metric gears, but that's fine for your purposes.

Cal