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Seastar
05-25-2016, 11:57 AM
I would like to add a DRO to my second lathe.
I need to keep the price reasonable but do not want glass scales because they fail with coolant or chip intrusion. I've had that problem.
I would like to use magnetic scales like on my mill because they can be cut to size and are more robust than glass.
Problem is, the only company I can find that sells a magnetic scale is DRO PROS.
Their product is very good but also relatively expensive.
Anyone know of a low cost magnetic scale supplier?
Bill

MaxHeadRoom
05-25-2016, 02:41 PM
There are several out there try a search using inductosyn as well as magnetic measuring scales, There is a UK company that use the inductosyn principle that uses ball bearings in a tube based on the inductosyn principle, Newall scales, but still expensive.
Also Mitutoyo.
Max.

Doozer
05-25-2016, 08:22 PM
I would consider Newall scales of the magnetic type
but most others that are calling themselves magnetic
(including Mititoyo) are actually capacitive inference.
Calling them magnetic is a misnomer.

--Doozer

MaxHeadRoom
05-25-2016, 11:30 PM
Many operate on the Inductosyn principle now, including Mitutoyo etc.
https://project-wire-scanner.web.cern.ch/project-wire.../rapport_inductosyn.pdf
Max.

Boostinjdm
05-25-2016, 11:35 PM
I would like to add a DRO to my second lathe.
I need to keep the price reasonable but do not want glass scales because they fail with coolant or chip intrusion. I've had that problem.
I would like to use magnetic scales like on my mill because they can be cut to size and are more robust than glass.
Problem is, the only company I can find that sells a magnetic scale is DRO PROS.
Their product is very good but also relatively expensive.
Anyone know of a low cost magnetic scale supplier?
Bill

Worth it.

Jaakko Fagerlund
05-25-2016, 11:53 PM
I need to keep the price reasonable but do not want glass scales because they fail with coolant or chip intrusion. I've had that problem.
How do you have them installed, since I've had zero failed glass scales due to said issues and these have been in daily use roughly 20 years.

CalM
05-25-2016, 11:59 PM
How do you have them installed, since I've had zero failed glass scales due to said issues and these have been in daily use roughly 20 years.

I can second the comment from Jaakko.

It's glass for me. I've had trouble with the Sphero-syn readers, but the scales work great!