Harrison 140 headstock taper

Harrison 140 headstock taper

This topic has 7 replies, 6 voices, and was last updated 20 September 2012 at 19:02 by KWIL.

Viewing 8 posts - 1 through 8 (of 8 total)

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20 September 2012 at 14:30 #98893
Nick Hopwood
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@nickhopwood71702
Can anybody tell me what taper is used in the headstock of a Harrison 140? The handbook says 3 morse but it obviously is not. Thanks.
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20 September 2012 at 14:30 #16893
Nick Hopwood
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@nickhopwood71702
20 September 2012 at 15:41 #98899
Keith Long
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@keithlong89920
Hi Nick

I may well be wrong about this but I think that Harrisons usually have a "bush" in the business end of the spindle and the 3MT taper is actually in that bush. Colchester do the same trick. On Colchesters the actual spindle taper is NOT a Morse taper but seems to be one of their own.

Your best bet is to measure the end of the spindle with a DTI and see what the taper actually is.

I've got the same issues with an old IXL Leader that I just acquired, it's headstock is a Colchester Master clone and I'm missing the spindle nose bush. The upside is that when i get round to machining one it can have whatever fitting I like inside!

Keith

Edited By Keith Long on 20/09/2012 15:42:31
20 September 2012 at 15:50 #98900
Ian S C
Participant
@iansc
Just been looking up your lathe, if the bore is 1 3/8", and the bore at the spindle nose is 1 5/8", you will find its called a 4.5 morse taper. Its a modified standard MT, not sure if its MT 4, or MT 5, proberbly the thick end of MT 4.

My Taiwanese lathe has a 5 MT spindle, with a 3 MT bush, I'd hate to have to pay for MT 5 tooling! Ian S C
20 September 2012 at 18:03 #98917
Nick Hopwood
Participant
@nickhopwood71702
Many thanks for your prompt replies. Looking at the handbook again it does look as though there is a bush in the headstock. Looks like another project for the future!
20 September 2012 at 18:42 #98920
blowlamp
Participant
@blowlamp
My Harrison M250 (D13 camlock spindle nose, 35mm through bore) has a reducer bush to allow a centre to be fitted.
Every reference I've seen, claims that this bush is a 5MT to 3MT, but I think it might actually be a 4.5MT to 3MT as the dimensions don't seem to marry up for a 5MT.

Your situation may be similar.

Martin.
20 September 2012 at 18:46 #98922
michael cole
Participant
@michaelcole91146
Same here with my boxford. 4.5 MT to 3MT bush in the headstock. Still availabe new from boxford.
20 September 2012 at 19:02 #98923
KWIL
Participant
@kwil
Harrison M300 is MT5, tailstock is MT3
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