Big Shed
10th June 2010, 10:41 AM
Having now received the VM120 chuck I bought on Ebay last week I have some questions about both it and the required insert.
The chuck is brand new in the box, but appears to be an older model, I believe the new model has indexing on the rear. That doesn't worry me as my lathe has indexing.
It came with a 3/4"x10TPI inesrt, which amazed me, wouldn't want to swing that lump of metal with a chunk of wood attached from a 3/4" spindle:oo:
Anyway, I put up a Wanted To Buy post for a 30x3.5 insert just in case someone had one spare. Another forumite contacted me to say he had one and we agreed on a price.
When he came to take it out for posting he noticed that this insert was different from the ones in his VM120 chucks, still has the 30x3.5 internal thread that goes on the spindle, but the external thread, the part that goes in the chuck, is different.
He describes it so:
What appears smaller is the thread that goes up into the chuck, to connect the insert to the chuck. On my VM120s their insert threads are about 30mm long and as coarse a thread as the lathe headstock ie 30 x 3.5. This spare insert I have has a thread that appears slightly finer, and only about 10mm long. I can only assume it's for a VM100 (but I thought it was for a VM120).
The insert I have here has an external thread diameter (the part that goes in the chuck) of 45mm and a thread pitch of 2mm, overall length of the part that goes in to the chuck, ie from shoulder that seats on the outside of the chuck to the end is 26mm, actual thread length is about 18mm.
So, my question to any of you VM120 owners out there is, could you tell me what size/pitch your insert is, and is it the same as the described in the blue quoted tecxt or the same as mine?
Confused:?
The chuck is brand new in the box, but appears to be an older model, I believe the new model has indexing on the rear. That doesn't worry me as my lathe has indexing.
It came with a 3/4"x10TPI inesrt, which amazed me, wouldn't want to swing that lump of metal with a chunk of wood attached from a 3/4" spindle:oo:
Anyway, I put up a Wanted To Buy post for a 30x3.5 insert just in case someone had one spare. Another forumite contacted me to say he had one and we agreed on a price.
When he came to take it out for posting he noticed that this insert was different from the ones in his VM120 chucks, still has the 30x3.5 internal thread that goes on the spindle, but the external thread, the part that goes in the chuck, is different.
He describes it so:
What appears smaller is the thread that goes up into the chuck, to connect the insert to the chuck. On my VM120s their insert threads are about 30mm long and as coarse a thread as the lathe headstock ie 30 x 3.5. This spare insert I have has a thread that appears slightly finer, and only about 10mm long. I can only assume it's for a VM100 (but I thought it was for a VM120).
The insert I have here has an external thread diameter (the part that goes in the chuck) of 45mm and a thread pitch of 2mm, overall length of the part that goes in to the chuck, ie from shoulder that seats on the outside of the chuck to the end is 26mm, actual thread length is about 18mm.
So, my question to any of you VM120 owners out there is, could you tell me what size/pitch your insert is, and is it the same as the described in the blue quoted tecxt or the same as mine?
Confused:?