The Shop > Tools
Making Simple QC Tool Holders
vtsteam:
Thanks black85vette, nice tool holders. I like the way that round one is trapped by the slide. I'm guessing there is a screw in back that pulls it in. The square one looks nice and solid and simple as well. I think I remember admiring those on CSEE. I did try radiussing the corner a little -- helped with finish, and burning the tip and well, made it easier to grind back a chip!
SwarfnStuff, thanks greatly for the actual commercial angles. To check the 12 + 12 deg compound in 3D I did a little drawing in Sketchup and the actual resulting compound angle is 16.7 degrees normal to the tool.
this gets subtracted from the grind angle to get the actual top rake. 28- 16.7 = 11.3 -- well wht do you know, the tool is practically 12, 12, 12 all around.
Making a new sharpening jig today.
vtsteam:
I ended up making a new tool rest for my bench grinder. I had been using the stamped metal bracket that came with it. I didn't make a super fancy replacement capable of sharpening end mills, etc. -- that's a project for another day.
I just put together materials on hand, namely some angle iron sections of a bed frame, a spare strap hinge, and some steel cutoffs, spot welded together. But it's a hundred times better than the grinding rest that came with the machine!
Then I was able to make a new tool bit for the tangential tool holder, and I got a true 28 degrees, measured, for the cutting face.
I honed it on a little diamond hone and tried it out on the same chewey steel test bar I had earlier. It gave the smoothest finish I've been able to achieve so far -- a personal best. Probably not as good as others can achieve, but It feels shiny smooth, which is a big improvement for me. I do see some slight regular variation in surface appearance, but I'm thinking that is probably due to lathe vibration and lead screw. I need to make a more solid base for the lathe than I have right now. The whole table top shakes.
Very happy with this tool post! I might reserve it for finish use, though. I'm not sure it's suitable for taking heavy cuts.
Here's a current picture:
black85vette:
The tool looks correct at that angle and the results confirm it. Depending on the metal and how secure the tool is held, I have found that I could take pretty deep cuts with mine. Your entire setup is great and would be excellent for someone starting out.
It would be cool if the tool holders were mass produced so someone could just make the post to fit their lathe and buy holders cheap if they didn't have a mill.
awemawson:
There was a chap in Australia selling them complete with a sharpening jig a few years back (maybe 7)
If I remember correctly they featured in an article in Model Engineer
RussellT:
Good job VT. :clap: :clap: :clap:
B85V. These tool holders can be made without a mill. There is also a similar commercial design - http://www.krfcompany.com/ but I don't think it includes a tangential tool holder. It is indexable though.
Russell
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