Metric threads on South Bend

[GordonL]

I will have to play around with that. The existing gear train gives an input of 1 to .375 of spindle to screw gear so if I add a combo gear in that ratio...

[GordonL]

The problem is that it must match the 127/120 ratio not the 127/100 ratio. The 13" SB has a 6TPI leadscrew and the others have a 8TPI leadscrew so...

[GordonL]

After doing a lot of playing around with calculations and spread sheets I have pretty much determined that the 127/120 transition is about the only good...

[GordonL]

I think that we are talking about two different situations. If the feed is only through change gears then lead screw enters into the calculations. If...

[GordonL]

The carriage is going to move 1/TPI no matter what the TPI in the lead screw may be. That is all determined by the gearing prior to the gear box....

[GordonL]

After thinking about it I do not think that the TPI in the lead screw make any difference. If the gearbox is set for 10 TPI it is going to move 1/10"...

[GordonL]

I had occasion where I needed a metric thread of 2mm pitch. I got by using 13TPI which worked for this application. Metric equivalent would be 12.7 TPI....

[GordonL]

At least locally many of the returned Amazon items are offered as pallet load on a bid basis. Many of the returned items are offered on Facebook marketplace...