MadModder
The Shop => Tools => Topic started by: Darren on January 15, 2010, 09:39:22 AM
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I would like to find a DTI that has the measuring button on the rear, usually a larger button than the normal types ... no luck so far ..
Does anyone know if they have a special name?
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I have always heard them called "button-back".
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I have always heard them called "button-back".
http://cgi.ebay.com/Starrett-196-back-plunger-Dial-Indicator-OB_W0QQitemZ350303654809QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518fb99399
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That's the type, I've not been able to find one in the UK .... :thumbup:
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That's the type, I've not been able to find one in the UK .... :thumbup:
Here's one.
http://cgi.ebay.co.uk/Mitutoyo-Series-1-dial-test-indicator-2226_W0QQitemZ200427731702QQcmdZViewItemQQptZLH_DefaultDomain_3?hash=item2eaa6c7af6
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Blimey, I thought that was a normal type when I scanned it quickly .... thanks, you're a star :ddb:
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Glad to help.
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Thanks to a little help from here I managed to get hold of one of these "button back" dial gauges
First job was to make a holder for it to use with the milling machine for tramming the head. A simple 20mm SS bar with a grub screw arrangement to hold the arm.
(http://i401.photobucket.com/albums/pp92/thebodger/Beaver/Traming%20Tool/IMG_4260.jpg)
(http://i401.photobucket.com/albums/pp92/thebodger/Beaver/Traming%20Tool/IMG_4261.jpg)
In the past I have used a normal type dti that we are all familiar with. Although this works well enough reading the dial as you spin it around is a real chore when it faces away from you.
With this gauge you can always read the dial with little trouble at all.
Here you can see the tram was about 8 thou out. The gauge reads in tenths so every ten divisions is one thou.
I got the tram down to two tenths in all directions which is rather pedantic but it I wanted to see if it could be done :dremel:
Rather pointless I know, cos if you lean on the machine it move a whole thou anyway so we can only guess what it's doing when cutting.
I would guess normally tramming to a thou would be close enough.
(http://i401.photobucket.com/albums/pp92/thebodger/Beaver/Traming%20Tool/IMG_4262.jpg)
(http://i401.photobucket.com/albums/pp92/thebodger/Beaver/Traming%20Tool/IMG_4263.jpg)
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Looks like that stem will accept different points, like a regular dial indicator. That could come in extremely handy! Looks like a right smart bit of kit. :thumbup:
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Yes the tip unscrews, as does the fixing arm.
It also has thread to take a tip to use like a regular plunge dti, though it's a different thread to the one on the back. You can see where it fits in the second picture.
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Darren, nice idea! I like the tramming jig/equipment that John and Stew made: http://madmodder.net/index.php?topic=822.0 but I don`t think I`d accurately be able to make everything square enough for a true reading! This bit of kit is excellent and I could do with another DTI.
Where did you buy from in the end?
Chris
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Hi Chris,
This gauge came up on the bay. :thumbup:
I too like Johns idea, but although making it accurately seems reasonable enough I just can't get it out of my head that loosing the squareness would be all to easy making it useless. A little knock or a warp and it would need re-machining.
Maybe I worry to much and the concept is fine, but this way I don't have to worry about such issues.
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Hi Chris,
This gauge came up on the bay. :thumbup:
I too like Johns idea, but although making it accurately seems reasonable enough I just can't get it out of my head that loosing the squareness would be all to easy making it useless. A little knock or a warp and it would need re-machining.
Maybe I worry to much and the concept is fine, but this way I don't have to worry about such issues.
Darren,
They were my thoughts at the time........
A finger clock has always worked fine for me. :thumbup:
David D