Colchester chipmaster dual dials

Hi, Adam.

Assuming the cross slide, the dial movement indicates the amount removed on the diameter. Half off radius (actual slide movement) equals amount off diameter.

Bill

Yes - it takes 400 thou off the diameter, which is often what you want on a lathe.

Murray

PS - I've never checked on my Bantam but I assume the compound / top slide is different ie direct reading, as it could move at any angle to the axis.

Edited By Muzzer on 24/06/2018 21:55:40

My Chipmaster has dual dials, takes 400 thou off diameter. While the imperial dial is accurate the metric is not. If I zero the dial in "thous" then the cross slide will consistently return to the zero position, checked with a DTI, zero on the metric scale is inconsistent. Anyone else noticed that? I tend to use the DRO so not a problem, would be nice if it was accurate on both scales.

My Triumph has dual dials fitted, absolutely consistent in both ranges.

John

No 'of course' about it. Traditionally British lathes measure depth of cut. Measuring diameter (which I find more natural except when cutting threads) is a beastly American innovation circa 1890.

My Chinese mini-lathe dial measured depth, it's big brother measures diameter. Not much consistency in the world of lathes.

Always worth double-checking before using an unfamiliar machine.

Dave

My Taiwanese Lathe indicates diameter, and I got trapped when I did some work on a mates Myford 7 that indicated DOC. I'll have to check the Menzshed Boxford A, the dial is tiny, and not easy to read.

Ian S C