RE: [CAD_CAM_EDM_DRO] LEAD SCREW"

Hi Jan,
My mistake!
The pitch is 2,5 mm, so the screw has four thread per 10 mm!
Also, the diameter is 20 mm
The surface can be polished (so said my friend, machinist)

ONCE AGAIN:
Does anybody made some linear motion with standard screws?
Peja

-----Original Message-----
From: JanRwl@... [mailto:JanRwl@...]
Sent: Thursday, January 16, 2003 4:42 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] LEAD SCREW"


In a message dated 1/15/2003 11:52:22 AM Central Standard Time,
peja@... writes:

> I can buy one meter long screw, 20 mm diameter with four triangular tooths

> per milimeter. (I think it's used in wood constructions).<<

This would be 0.25 mm per thread? That is VERY fine, as would be used on
1.0
mm. screws! Are you sure you don't mean four mm. per thread? I use 20 mm.
dia. screws with 4 mm pitch on my machines (but ACME threads).

> It seems to me usefull as axis leading screw. HOW MUCH IT CAN BE PRECISE

?

If this material you describe is simple V-thread "All-Thread" ("Fastener
stuff"), it is not only probably not very precise, but the surface of the
threads is rough, intended for fastener-nuts which are turned with a WRENCH
("spanner" in England), and let remain still forever!

Jan Rowland