I've been a bit slow on making any more toolholders because I needed to move the car out of the garage to get enough room around the big bandsaw to handle the 5' piece of 2" x 2" steel I picked up. Too tired after work to bother with all that. Yesterday, I got home from a trip out and left the car outside. To make it all worthwhile, I cut half a dozen blocks in two sizes and two different lengths. All out of excuses now.
Holder #3 is a 3/4" boring bar holder. Since it will only be used parallel to the ways, it doesn't need to be 4" long. I'm getting better at cutting the dovetails. I can cut 0.050" DOC with each pass of the single-insert carbide cutter.
Once the basics were done, the holder went into the toopost for boring on the lathe. Centre drill, then passes with progressively sized drill bits to get close to the final size. I have quite a few adjustable reamers, some of which came with the big lathe. Unfortunately, 3/4" wasn't included in the mix. Finished off with a 3/4" bit, which cut a tiny bit over.
The usual drilling and tapping for the clamping screws, then back to the Victoria for the slitting. I got around 20 slitting saws with the mill, so it was no problem finding one that would do the job.
It took quite a lot of torque on the clamping screws to tighten up the holder, but that wasn't unexpected. The steel block was quite thick. you can see a slot on the top of the holder. That runs down about 3/8" to allow the metal to bend a bit easier. Still lots of meat below the boring bar, where it needs to be. The black double-end bar is one that came with the lathe.
Holder #3 is a 3/4" boring bar holder. Since it will only be used parallel to the ways, it doesn't need to be 4" long. I'm getting better at cutting the dovetails. I can cut 0.050" DOC with each pass of the single-insert carbide cutter.
Once the basics were done, the holder went into the toopost for boring on the lathe. Centre drill, then passes with progressively sized drill bits to get close to the final size. I have quite a few adjustable reamers, some of which came with the big lathe. Unfortunately, 3/4" wasn't included in the mix. Finished off with a 3/4" bit, which cut a tiny bit over.
The usual drilling and tapping for the clamping screws, then back to the Victoria for the slitting. I got around 20 slitting saws with the mill, so it was no problem finding one that would do the job.
It took quite a lot of torque on the clamping screws to tighten up the holder, but that wasn't unexpected. The steel block was quite thick. you can see a slot on the top of the holder. That runs down about 3/8" to allow the metal to bend a bit easier. Still lots of meat below the boring bar, where it needs to be. The black double-end bar is one that came with the lathe.
Mike
If you can't get one, make one.
Hawkeye, proud to be a member of MetalworkingFun Forum since Jan 2013.
If you can't get one, make one.
Hawkeye, proud to be a member of MetalworkingFun Forum since Jan 2013.