Re: MLA-23 QCTP Boring Bar Tool Holder

John Dammeyer




From: [] On Behalf Of Keith Douglass
Sent: February-19-22 4:11 PM
Subject: [SouthBendLathe] MLA-23 QCTP Boring Bar Tool Holder


I wanted to share a project I’ve been working on the last couple of nights.  I’m preparing to machine a faceplate and thought it would be a good excuse to make a boring bar holder for my quick change tool post.  The plans included with the QCTP drawings called for brass-tipped set screws for the holders, but I’ve been wanting to try some cotter clamps ever since reading about them in Lautard’s First Machinist’s Bedside Reader.  I’m very happy with how it turned out so far, and I’m excited to use it soon on my next project.  I ran out of space for the height adjustment screw, which normally get put right in the middle of the holder close to the dovetail.  Since I wanted to keep the bar as close as possible to the post, I opted to move the screw to the front of the holder.  It makes full contact with the base plate and I do r expect I’ll have any issues with it there.  Next up is drilling the bar for the cutter and clamp.

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