Centre scope

[Tractor manParticipant @tractorman]

Hi all.
Bought an isoma centre microscope today. Complete but the arbor is morse 3 and I want to change it to morse 2. Trying to find the thread size of the body from isoma or if I can buy a ready made Morse 2 adaptor. Hope it will make setting up a bit easier. £50 makes it a bargain in my books. Regards

[Tractor manParticipant @tractorman]

New tool acquisition

[Michael GilliganParticipant @michaelgilligan61133]

Nice buy !!

MichaelG.

.

Edit: you may find some encouragement in this previous thread

http://www.model-engineer.co.uk/forums/postings.asp?th=66226

Edited By Michael Gilligan on 23/01/2017 16:39:56

[Brian OldfordParticipant @brianoldford70365]

Google is your friend.

Looking at most of the items and the text at the bottom of the page at http://www.isoma.ch/en/products/microscopes/standard-executions/centering-microscopes/ my guess is M15 x 0.75.

[EmgeeParticipant @emgee]

Hi Tractor man

If for use on a mill turn the MT shank to parallel and fit into a collet, a picture of the tool would be nice.

Emgee

[Tractor manParticipant @tractorman]

Hi all.
I’ve popped a couple of photos in my new tools album rather than attach to the message. The small thread appears to be M15 x 0.75 as mentioned but the larger thread might be easier to cut. Regards

[Tractor manParticipant @tractorman]

I think the larger thread is M28 by 0.75 I will have to have a practice at thread cutting on the lathe. Any tips or pitfalls for such a thread? I have a metric boxford lathe.

[John ReeseParticipant @johnreese12848]

When I think of the contortions needed to use that thing, my old back hurts.

When you get the new arbor mounted you should check the zero. Make a mark on a piece of metal. Center the crosshairs on the mark. Rotate the spindle 180 deg. The crosshairs should hit the mark. If they don't, adjust the crosshairs 1/2 the distance to the mark. Rotate the spindle and check again. Adjust as before. Repeat until the hairs stay on the mark when the spindle isw rotated 180 deg.

By the way, I have no knowledge of your scope or how it is adjusted. The procedure I described works for surveying or optical tooling instruments.

[John ReeseParticipant @johnreese12848]

If you regularly use a collet in the mill you may want to consider a straight shank that corresponds with your most used collet.

[Neil WyattModerator @neilwyatt]

Posted by John Reese on 24/01/2017 00:02:47:

By the way, I have no knowledge of your scope or how it is adjusted. The procedure I described works for surveying or optical tooling instruments.

And polarscopes! They use three grub screws to move the reticle.

Neil

[Tractor manParticipant @tractorman]

Gents, some good information there. I have mailed the company in Switzerland and hope for some further info. The straight shank sounds a good call. Will have a think. Mick

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