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

[jlficken]

It will come off with the magic ingredient.

Patience….

Try locking the back gear and putting a cheater on your wrench with a weight hanging off the end as you’ll see detailed elsewhere on the forum.

Let’s get the chuck off and go forward from there.

John

I've seen so many posts of broken back gears when trying to use them to remove a stuck chuck that I'm scared of doing it as I can't really afford to break the machine as I don't have the skill to make new gears for it.

I'll see if I can find those threads though.

I did watch this video and it seemed like a possible option, however, I'm not quite there yet.

 

[jlficken]

Holy crap

I put a 1.5” solid bar about 3.5ft long in the chuck with 70lbs of weights on the end just where the machine started tipping, put my hand on the back side of the headstock, pushed down pretty lightly on the end of the steel bar, and the chuck moved!!!

I couldn’t believe it!!!!!!!

Thank you so much!!!!!!





The spindle is M55x3.

Now to try to find a semi-finished adapter plate for a 4-jaw chuck.

 

[Downwindtracker2]

On my '91 DF-1224g , I found my stub shaft to be some DIN standard with 8tpi . Goofy , eh.

Grizzly sells South Bend plates. I haven't turned mine yet but those that have, have complimented the quality of the cast iron.

 

[jlficken]

On my '91 DF-1224g , I found my stub shaft to be some DIN standard with 8tpi . Goofy , eh.

Grizzly sells South Bend plates. I haven't turned mine yet but those that have, have complimented the quality of the cast iron.

Mine’s actually 8tpi as well I’ve discovered.

I have some blank HHIP plates now that seem to be of good quality (they better be given their cost) so I just need to figure out how to machine them. I’d have much rather just bought a semi-finished back plate as I’ve never threaded anything successfully on my lathe.

 

[DavidR8]

That's the same spindle spec as my DF-1237. It's definitely and odd-ball size.

 

[Downwindtracker2]

I haven't programmed my VFD on my lathe yet. That's another story. But to adapt the South Bend plates, I thought I would first make a test stub shaft, then I could use it to check my fit and internal threading. I have already picked up a cheap thread mic , internal and external threading tool holders. I already have the metric mics. I'm not a machinist, so it's just my thought.

 

[matthewsx]

Holy crap

I put a 1.5” solid bar about 3.5ft long in the chuck with 70lbs of weights on the end just where the machine started tipping, put my hand on the back side of the headstock, pushed down pretty lightly on the end of the steel bar, and the chuck moved!!!

I couldn’t believe it!!!!!!!

Thank you so much!!!!!!

View attachment 512133
View attachment 512134
View attachment 512135

The spindle is M55x3.

Now to try to find a semi-finished adapter plate for a 4-jaw chuck.

Happy to hear you got the chuck off, maybe you can source the backplate out of Canada?

If not, well....

You do have a lathe

John

 

[jlficken]

Happy to hear you got the chuck off, maybe you can source the backplate out of Canada?

If not, well....

You do have a lathe

John

Thanks!

I’m not sure where to even look in Canada but it’s a thought.

I may give it a try on my machine once I get the DRO installed. I’m just a bit stressed about it since I’ve never done internal threads and only external a couple of times.

I like the idea of making a stub to test with first and going from there so I’ll grab some aluminum and try it.

 

[DavidR8]

If I recall correctly, a backplate with a 2.25” bore can be opened up and threaded to fit.

 

[jlficken]

If I recall correctly, a backplate with a 2.25” bore can be opened up and threaded to fit.

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