• Scam Alert. Members are reminded to NOT send money to buy anything. Don't buy things remote and have it shipped - go get it yourself, pay in person, and take your equipment with you. Scammers have burned people on this forum. Urgency, secrecy, excuses, selling for friend, newish members, FUD, are RED FLAGS. A video conference call is not adequate assurance. Face to face interactions are required. Please report suspicions to the forum admins. Stay Safe - anyone can get scammed.

Integrated 1-1/2 chuck

P

PeterT

Ultra Member
Premium Member
On 'integrated' chucks like this, are the threaded holes in the backplate intended to jack (un-press) the back plate off from I assume would be a typical recess?
ie. could this style of chuck be re-purposed by removing the backplate? Or maybe there is more to it?
 

Attachments

  • EDT-2023-03-13 7.42.39 PM.jpg
    EDT-2023-03-13 7.42.39 PM.jpg
    71.5 KB · Views: 27
That looks like the same chuck HH Roberts sells. If it is then yes the threaded holes will press the backplate off.
Edit - the HH Roberts chuck are 5".
 
Last edited:
PeterT said:
On 'integrated' chucks like this, are the threaded holes in the backplate intended to jack (un-press) the back plate off from I assume would be a typical recess?
ie. could this style of chuck be re-purposed by removing the backplate? Or maybe there is more to it?
Click to expand...

Usually they can be repurposed but sometimes they cannot - depends on how integrated is the back plate - i.e. is it a flat back chuck with a back plate attached to it OR is it an integrated chuck. Integrated chuck would have the back plate serve to hold the internals of the scroll. Still can be re-used BUT now you need to do a lot of possible leg work - i.e. figure out how to change things.
 
And on Bison chucks you will need those jacking holes :-) the plate is a very tight fit. Other brands not so much.
I replaced the 1 1/2-8 back plate with a 1 3/4-8 one.
 
This bison chuck can accept another back plate. It has to be precision machined, as the registration is a tight slip fit on the outer parts of the chuck...
 
Tom Kitta said:
Integrated chuck would have the back plate serve to hold the internals of the scroll.
Click to expand...
That's exactly what I was wondering & I don't know where I came across a picture that is sticking in my mind. It may have even been a collet chuck. But seems to me the parting line on that was through the plane of tightening studs, not behind like model pictured.
 
If the parting line is 1/2 way through the tightening pinions, then:

You can chuck up the entire body, and turn off the mounting boss for the threaded holder, face the plate, and then use that to make a new registration ring, and thus reattach a new adapter plate - of course new holes will need to be tapped the the new adapter plant, but no biggie...

There is always a way!
 
I'll correct my statement, having just gone through this tonight with a 3285 (4" Bison). The backplate is part of the mechanism, so can't be eaisly relaced. In my case is is threaded for a BS0 dividing head, and of course some cretin has lost the one set of jaws. :-) I hade been hoping to swap this partial chuck with a complete one.

On the 5" from HH Roberts, you can however repplace the backplate, it is not part of the mechanism.

Gerrit
 
The actual chuck says 3284-4" & 3172-05. Not that the thread matters but I'm pretty sure its the 1.5-8 'bolted on' threaded backplate. I'll take a picture next time

It might be this one: 7-805-0452 3284-4"1-1/2"-8
But it doesn't really show the required detail.


I might be getting myself confused with integrated Set-Tru chucks, they have a different adapter split line.
 
Last edited:
gerritv said:
3285 (4" Bison). The backplate is part of the mechanism, so can't be eaisly relaced.
Click to expand...
Hmmm.. that looks quite similar to what I referenced other than mine is 4".
Do you have any reference or a pic of what the mechanism is? Like machined features that engage the scroll or axles?
 
You must log in or register to reply here.
Back
Top