Question for those in the know....

Are the leadscrews in all BPs the same(other than length)? I need a
new lead screw for my M head BP(30s era machine), and have found one
that came out of a newer J head machine(70s era machine).

If the diameter and pitch are the same, I can figure out the rest, but
wasn't sure if they would fit the same nuts/etc.

Thanks

JW

In article .com,
jw wrote:
Question for those in the know....

Are the leadscrews in all BPs the same(other than length)?

Not all, for certain. Most use Acme threads, but my BOSS-3 CNC
Bridgeport uses ballscrews instead, and those won't interchange. (Aside
from that, the X-axis leadscrew does not rotate -- it is firmly fixed to
the right-hand end of the table, and the ball-*nut* rotates in a pair of
opposed tapered roller bearings. (Obviously, no handwheels for this
machine.)

I need a
new lead screw for my M head BP(30s era machine), and have found one
that came out of a newer J head machine(70s era machine).

If the diameter and pitch are the same, I can figure out the rest, but
wasn't sure if they would fit the same nuts/etc.

I'm pretty sure that the pitch is the same for all manual
Bridgeports (to check, does the dial on yours read 0-0.200" for a full
rotation?) If so, then it is 5 TPI. Whether the older M-head machines
had the same diameter -- I don't know.

Good luck,
DoN.
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