Could some kind soul with a Student have a look and tell me what the
diameter and tpi is on a Student cross slide feed screw please.
Thanks
Charles
- posted
16 years ago
Colchester Student Question
Loading thread data ...
- posted
16 years ago
Hello Charles,
On my machine it is .750" O.D. x 10 TPI. Have no idea of the metric one if that applies. If you need any scans from the Student instruction and spares manual, please advice.
DickGays, Leicester, UK.
On my machine it is .750" O.D. x 10 TPI. Have no idea of the metric one if that applies. If you need any scans from the Student instruction and spares manual, please advice.
DickGays, Leicester, UK.
- posted
16 years ago
Hello Charles,
Seeing your question this morning I looked at my cross slide lead screw and sent you a hasty reply. My earlier reply was inacurate. Something at the back of my mind has been telling me all day that 10 TPI can't be right, and it isn't. It looks like 10, but us in fact 5 TPI with double start. The cross slide moves .200" per turn, not .100". My apologies for this stupid mistake.
Dick Gays, Leicster, UK
Seeing your question this morning I looked at my cross slide lead screw and sent you a hasty reply. My earlier reply was inacurate. Something at the back of my mind has been telling me all day that 10 TPI can't be right, and it isn't. It looks like 10, but us in fact 5 TPI with double start. The cross slide moves .200" per turn, not .100". My apologies for this stupid mistake.
Dick Gays, Leicster, UK
- posted
16 years ago
Thanks Dick. Close but no cigar.
My search for a 3/4" 10tpi left hand acme/square continues.....
Charles
Charles
- posted
16 years ago
Are you sure, Dick? Or does the dial indicate .200" per rev?
Otherwise that means .400" removed off the diameter per rev
of cross-slide screw.
Tom
Tom
- posted
16 years ago
Yes Tom, I a m sure of this on my machine which I believe to be
standard. It does have combined imperial/metric dials and when in metric
mode removes 10 mm off the diameter per turn which is of course near to
the .400". I'm not sure what gear ratio they use to convert from
imperial to metric, can have a look if you like.
Dick Gays, Leicester, UK.
Dick Gays, Leicester, UK.
- posted
16 years ago
Unlike some Taiwanese machine copies of Colchester lathes that
indicated that 2.5mm = 0.1000".
Tom
Tom
- posted
16 years ago
In article
, Dick Gays
writes
Odd...
I checked a friend's Colchester Student operating manual and also measured the actual screw on his machine yesterday, and it has a 6 tpi single-start lead-screw.
Odd...
I checked a friend's Colchester Student operating manual and also measured the actual screw on his machine yesterday, and it has a 6 tpi single-start lead-screw.
- posted
16 years ago
Six ???
So what does he have on the dial as regards numbers
100 / 6 = 16.6666666
-- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:-
100 / 6 = 16.6666666
-- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:-
formatting link
- posted
16 years ago
In article , John Stevenson
writes
Good point...
I'll have another look when I next go to see him.
I'll have another look when I next go to see him.