Isoma Centering scope tear down

This topic has 11 replies, 6 voices, and was last updated 8 November 2017 at 08:34 by Piero Franchi.

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5 November 2017 at 17:14 #325608
Piero Franchi
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@pierofranchi37209
Hi Guys

Might any one know if this centering scope can have its tapper changed??

At the moment its a Int 40, I would like to have a 2MT on it to fit my Tom Senior Mill

Isoma,s website is has very limited info and a week of waiting for a email has seen no reply!!!!

I have a photo of the scope in my album
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5 November 2017 at 17:14 #25609
Piero Franchi
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@pierofranchi37209
5 November 2017 at 17:27 #325612
Oldiron
Participant
@oldiron
From what I can determine from a quick Google. These scopes have a M15 x 0.75 thread. It should be possible to change the arbour. **LINK**
5 November 2017 at 17:34 #325613
Piero Franchi
Participant
@pierofranchi37209
So it possibly just un screws out????
5 November 2017 at 19:07 #325630
Samsaranda
Participant
@samsaranda
Drawings on Oldiron's link specifies the attachment thread so just a matter of obtaining a 2 MT arbour with a blank end that can then be threaded to suit, a simple project I would think.

Dave
6 November 2017 at 18:38 #325785
Piero Franchi
Participant
@pierofranchi37209
I managed to take the 40 Int arbor off the scope today,

Knowing it was only a thread fit gave me a little more confidence in what I was doing as it took a hell of a lot of turning force before it budged

lots of time, and soft jaws etc but it finally came out.

Now to look for a reasonable priced M15 .75 die !!!!!!!!!!!!
6 November 2017 at 18:53 #325792
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Piero Franchi on 06/11/2017 18:38:31:

… Now to look for a reasonable priced M15 .75 die !!!!!!!!!!!!

.

If you don't mind me saying so: I think screwcutting might be more appropriate.

MichaelG.
6 November 2017 at 19:39 #325797
Neil Wyatt
Moderator
@neilwyatt
Accurately machining the 16mm register will be critical.
6 November 2017 at 20:03 #325802
Tractor man
Participant
@tractorman
Hi I did the reverse, changing my morse 2 taper to a 30 int.
If I can find the morse shank and it has the right thread I can send it to you.
Regards Mick
7 November 2017 at 08:36 #325838
Piero Franchi
Participant
@pierofranchi37209
Mick if you do manage to find it I would sure be a VERY gratefully man

Happily pay the postage etc
7 November 2017 at 19:45 #325910
Tractor man
Participant
@tractorman
Piero.

I have looked at the arbour and it's a Morse 3 unfortunately. But I did remove the brass adaptor ring which reduced the body thread of the scope to the thread on the arbour. Your welcome to PM me and I can send you images. You may be able to use my parts to assist in making a Morse 2 arbour.

Regards Mick
8 November 2017 at 08:34 #325957
Piero Franchi
Participant
@pierofranchi37209
PM sent
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