Spindle thread size on Buffalo Power BP-1236? The chuck is off!!!

[DavidR8]

I didn’t figure that’d work since 55mm is 2.165” but I could be wrong.

No I’m wrong on this one. The minor diameter on my faceplate is 2.219” so 2.25 would be too large.
2.125 or 2-1/8 bore would work... maybe that's what I was thinking.

 

[jlficken]

So using the thread wires that I got I'm getting 2.1745" on the micrometer so after subtracting .10775" I come up with 2.0670" for a diameter.

I tried it 3 times and was in the same ballpark so I'm not sure what size it is now.

Here's the 2-1/8" x 8tpi thread dimensions that I found - https://www.machiningdoctor.com/threadinfo/?tid=223

I think I'll just stick with the 3-jaw forever

 

[DavidR8]

There are M39 backplates available that would likely have enough material on the spigot to be machines out to ~55mm

 

[matthewsx]

You have a working machine now so there’s that.

When I had a rare thread on my Star lathe I ended up buying a tap off eBay.

Patience will serve you well here, keep checking eBay and figure out what the Bison model number is for the backplate you need. It’ll come up eventually.

John

 

[RJSakowski]

Grizzly sells replacement back plates for the G0602 which has a 1-3/4 x 8 tpi thread. The 6" backplate has an O.D. of 6-1/4", A boss diameter of 5-1/8", and a hub diameter of 2-5/8". There are four mounting holes for the chuck but you can easily add new holes to suit.

 

[jlficken]

I’m not opposed to using a tap, however, I’ll need to figure out what size it is first unless I just spend $60 and get a tap just to test with.

 

[Downwindtracker2]

The most annoying problem of getting old is the loss of memory. I simply for the life of me remember the DIN #. DIN is German standards . Which is what Europe and in our case Asia uses. However my plan was to use the backing plate of the chuck as a faceplate , bolting the new backing plate for my 8" four jaw inside out. Measuring my stuff I found them to be in even numbers, just in metric. A 50-75mm mic would be handy for making the stub. I have mics up to 200mm so I'm covered. Here in Canada we work in both imperial and metric.

 

[Pevehouse]

Looks identical to my Taiwanese enco as well. Mine is 2 1/4 -8

 

[DavidR8]

Looks identical to my Taiwanese enco as well. Mine is 2 1/4 -8

I’m curious about the dimensions. Would you measure the major diameter of your spindle?

 

[matthewsx]

I’m curious about the dimensions. Would you measure the major diameter of your spindle?

See post #6 in this thread for mine.

John