Recent content by chipswarf

Howdy. I would like to claim one of these file sets. Can Paypal or send check/MO. PM inbound.

A shout out for David Haythornthwaite's site, specializing in the Myford Super 7. http://www.haythornthwaite.com/Engineering.htm Mark

Thanks, Beagles! The Vintage Machinery site was new to me (though I had the OWWM cousin) and that decal article is brilliant. Mark

A technique I've seen recommended has you start the hole undersize, then open to just the planned drill diameter with a boring tool, D-bit or end mill, to guarantee straightness and concentricity. This serves as a guide for the full diameter drill. In older texts, it's often shown how to...

Roger on the crossfeed creep (the phenomenon, not the ne'er-do-well). I was taught to give the tool post a little tug to zero the backlash before engaging the feed. This, on a well worn lathe. The same thing can be done with a simple fix that also changes the stiffness of the tool setup, which...

Well, fui, or good for me, depending. I started thinking this Lt/24 thing must have been familiar to the old shop hands and just found it on page 481 of the 4th edition, 1991, of "Machine Tool Practices" by Kibbe, Neely, Meyer and White. Probably in every comprehensive shop text since 1871. So...

Gentlemen, thanks very much for your warm welcome, and the shout out from other Texicans. On balance, I expect to learn more than I contribute, but just sitting and listening in this sort of community is a comfort and a pleasure. Good on you all for creating such a place. Mark

Mark Kilgore here, in the hills west of Austin, Texas. I joined some time ago, but waited until retirement to participate much. I don’t make models, but have always had tools and a bench. Just now, there’s a Myford Super 7 long bed, Clausing 8530 mill, South Bend 7” shaper, Powermatic bandsaw...

CJ, the effective length of a center-drilled workpiece can be measured as follows. Seat a pair of balls in the drilled centers, ones that match the diameters of the lathe center balls. Measure length over these balls and subtract the radius of each ball. This is the workpiece length (hypotenuse)...

Maryak, your technique of using tan instead of sin is right on for small angles. Recall that tan = sin/cos. For small angles, cos angle is nearly one. Mark

I agree with Captain Jerry's analysis. The distance between the lathe centers decreases as the offset is increased, the constant is workpiece length, which is the hypotenuse, with center distance being the cosine side and the offset being the sine side. With this in mind, the algebra looks...