MetalworkingFun Forum

Hello all, I’m new here. I have just purchased this lathe, dated 1975.
The machine is stamped on the casting:
112605
INSP4
 
And on the plates:
sr. nr. B49084
List nr. SH434
Amp. 2/3.75
AC~50
Volt 340/380
It is an imperial machine and I would like to convert here to metric. Is it possible?
Where can I get a manual for her?
Who stocks spare parts for this lady?
Any thing else I should know about her?
Thanks a lot for any help.
Michael.

nice lathe, great score.

I think one of the guys in the UK did a complete tear down and rebuild on a Harrison, you will have to wait and see what pops up.

Here's some info:  http://www.lathes.co.uk/harrison/index.html

(08-06-2015, 03:20 AM)Steinmann Wrote: [ -> ]It is an imperial machine and I would like to convert here to metric. Is it possible?

Did you have any change wheels with the purchase a 127, 60, and 40 tooth is required for metric conversion if I remember correctly.
What wheels are under the head cover.
Trev

Well, at the moment there are mounted in the gear 25T, 80T and 100T.
It also came with 50T, 60T, 63T and 127T stored, oiled and wrapped.

The 127 tooth gear is the important ingredient in cutting metric threads on an imperial machine- being the lowest whole multiple of 25.4 which of course is mm to inch. Was missing from my lathe when I bought it and I made a 100km round trip to the previous owner to get it- only to find it had been lost! Not the same as converting the whole machine to metric, if by that you mean the feed dials etc but that would be an impractical task. Looks like a nice lathe you have, I'm sure you will enjoy it. There may be a chart on the machine showing the arrangement of the change gears for the various thread pitches.

to change the feed dials to metric just putting a DRO on it, will probably be cheaper and more accurate

Harrisons are nice machines.  Ya done good!

You may want to see if you can get a 127 tooth gear from Boston Gear or a similar mass manufacturer.  All you should have to do is bore it and cut the keyway.  As to converting it to metric I agree that a DRO is the way to go.

American Metric (ametric.com) is another good source for gears.

he has the 127 tooth gear