Actually the second. If I had a million dollars I would hire a full
time patent attorney and file.
I have an old CC lathe built in 1977 and the 3 jaw runs out about
.002. Unacceptable for gear box work. What is worse is adjusting a 4
jaw to zero the run out. So I combined some of the features of the 4
jaw and the 3 jaw. This is an adjustable backing plate adapter.
Besides that the locating bore in the back of the 3 jaw was not even
round.
This is located on the OD of the chuck which in this case 6.25 inches
roughly. Probably metric. It matters not if the OD of the chuck runs
out as well. Once it is locked down you have a super accurate 3 jaw.
There are four 10-32 set screws that do the adjusting then the chuck
is locked down with three 8 mm screws. 32 threads per inch is far
better than the adjusting barrels on the four jaw which are about 6
threads per inch.
The one inch thick CR steel round was bought from Industrial Metals
in Sun Valley for $37.
It takes days to machine this. One of the problems with my lathe is
the cross slide feed is only in one thou increments. (.001) To
build a near zero run out adapter one needs 1/10 th thousands feed.
(.0001)
Paul Lamar
Paul, you're too late on that one - Adjustable back plates for 3-Jaw
chucks have been around for at least 60 years and probably much
longer - I had a couple of that type of adjustable back plate chucks
back when I had my own tool and die shop -
Roland Friestad
Damn! How come I did not hear about it. I never saw an add.
I am half done.
Another problem is I searched high and low for a new back plate that
would fit. No luck so far.
-------------------------------------------------------------------------------
Good Morning Paul,
I am not having any luck finding spindle information for your
machine, even with my own IPad. My only suggestion is to try to use
that measurement guide that I sent or to see if you can find a
manual. Other than that, you may have to contact a local machine
shop. Hopefully someone can come in a measure it for you.
I wish I could have been more helpful.
Kathy ColonyImage result for patriotic clip art images
One Hardinge Drive
Elmira, NY 14903
Tel 800-228-2825
Fax 607 398-7998
info@buckchuck.com
thanks kathy
Paul
On 12/02/2016 01:45 PM, Kathryn Colony wrote:
Hi Paul,
I’ve done some digging and so far I’m coming up empty. I am blocked
from checking quite a few sites at work though. I’ll bring my IPad
next week and see what I can find there.
Have a good weekend and I’ll get in touch on Monday.
Kathy ColonyImage result for patriotic clip art images
One Hardinge Drive
Elmira, NY 14903
Tel 800-228-2825
Fax 607 398-7998
The lathe is a King Model LAM350B Made in 01/11/77
Paul
On 12/02/2016 12:16 PM, Kathryn Colony wrote:
Hi Paul,
Unfortunately we have to have the full information. On page 6 of our
catalog, which I believe you have seen, there is a 2-3/8-6 option
which would be 6 threads per inch but it is not available as a
standard adapter plate.
I have one more option to try. What is the make and model of your
machine and I can look up the spindle specs? Kathy ColonyImage result
for patriotic clip art images
It about 6 0r 7 threads per inch.
Paul
Paul Lamar
I'm not sure that this is the same machine you have but in the off
chance that it is:
http://machine.archives.verhey.org/items/show/42
Mark LaPierre
Yes that looks like it.
Paul Lamar
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