Thread: colchester progress

Originally Posted by azzrock

well unfortunately i have no camera atm.
short version is the carriage was moving during
internal thread cutting. I ended up doing the job on another
lathe.
ive had the carriage off. Now its ready to replace it seems that there's no easy way
to do it. One of the apron gears is to high for the carriage to easily refit.
so to remove the apron the lead screw needs to come out.
Has any one here done this job on one of these old colchesters? because i cant get the lead screw to move away from the qcqb drive shaft.
Ive heard the qcgb has to come of as well. surely not?
aaron

It came off, it should go back on (yeah I know, famous last words). Any gears sticking above the join line are either going into a space provided for them, or the gear is trying to mesh with the one on the cross slide screw and fouling, probably because there's a tooth to tooth positioning issue. Try rotating the cross slide screw a little and see if things drop into place.

That's about all I can think of. I've had my Chipmaster apron off but it was quite a while ago.

PDW

Originally Posted by PDW

It came off, it should go back on (yeah I know, famous last words). Any gears sticking above the join line are either going into a space provided for them, or the gear is trying to mesh with the one on the cross slide screw and fouling, probably because there's a tooth to tooth positioning issue. Try rotating the cross slide screw a little and see if things drop into place.

That's about all I can think of. I've had my Chipmaster apron off but it was quite a while ago.

PDW

hi Pdw thanks mate
while it was apart i refitted a bush that had come adrift to the apron. the bush sits inside a ring on the tail stock end of the half nut. so now the apron doesn't have as much movement I think ill have to remove the gear box.
the drama is refitting the piece that stops the apron rising off the v way with the apron in place.
the out put drive of the qcgb looks to be a female hole with a key way. the lead screw being the male part. i haven't been able to move the lead screw thou.
i had the cross slide disassembled for this so no cross slide screw.

Originally Posted by azzrock

hi Pdw thanks mate
while it was apart i refitted a bush that had come adrift to the apron. the bush sits inside a ring on the tail stock end of the half nut. so now the apron doesn't have as much movement I think ill have to remove the gear box.
the drama is refitting the piece that stops the apron rising off the v way with the apron in place.
the out put drive of the qcgb looks to be a female hole with a key way. the lead screw being the male part. i haven't been able to move the lead screw thou.
i had the cross slide disassembled for this so no cross slide screw.

OK I can see that getting access to the gib might be an issue with the apron hanging there.

This applies to the Chipmaster so maybe not your model.

The power feed shaft has a U shaped recess in the QCGB end that engages a fixed pin in a stub shaft. You can just pull the thing towards the tailstock and it'll slide out.

The leadscrew is coupled via a sliding dog clutch and also comes out easily toward the TS end.

So if you're lucky, your model Colchester is more or less the same. Otherwise, have fun......

PDW

Originally Posted by PDW

OK I can see that getting access to the gib might be an issue with the apron hanging there.

This applies to the Chipmaster so maybe not your model.

The power feed shaft has a U shaped recess in the QCGB end that engages a fixed pin in a stub shaft. You can just pull the thing towards the tailstock and it'll slide out.

The leadscrew is coupled via a sliding dog clutch and also comes out easily toward the TS end.

So if you're lucky, your model Colchester is more or less the same. Otherwise, have fun......

PDW

ok thanks the power feed does have a simple drive ill check it out.

I removed the front of the gear box. Gave me a better view there was a cir clip
positioning a selector gear once this was slid out of the way it allowed room for a threaded collar to be loosened and then the lead screw could be pushed towards
the tail stock.
Now i can resemble. I refitted the carrage hold down bit to the carriage.
i thought it would be a tighter fit .I can raise the apron side carnage. 0.45mm
the back side is still just sitting on the ways and bolted down yet.
aaron

does any body eles here have one of these colchester 1 1/2 student/ master?

There is a YAHOO group for Colchester lathes . I am a member of around 10 Yahoo groups of various interests . There is a Yahoo Harrison lathe groups and a Drummond lathe group, plus many more for specific brands Mike

Originally Posted by morrisman

There is a YAHOO group for Colchester lathes . I am a member of around 10 Yahoo groups of various interests . There is a Yahoo Harrison lathe groups and a Drummond lathe group, plus many more for specific brands Mike

thanks mike. Im a member of on of these . what can i say i like it here more.
aaron

Originally Posted by azzrock

thanks mike. Im a member of on of these . what can i say i like it here more.
aaron

I am a member of 3-Leblond, Rivett and Holbrook. I have found them very good for machine specific problems. Every one has a few guys who will reply to almost everything and seem to know a hell of a lot about the machines.

Ew