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My Brother is the one that collected a bucket full of railroad spikes for me, so I thought it was fitting that I would make a knife out of one for him. It was great to see the look on his face this year when he opened his present.
I designed it to be somewhat universal - Using a flat platten, having the big wheel out, little wheel out, etc...
The table is a dog-bone design built with ball bearings joined with a rod. The table can move any angle at any location, as well as moved to be used in the vertical position.
This unit has to live on my grinder bench and room is getting real tight, so I designed the unit to have a motor overhead (keeps grinding dust out of the motor) and uses a cross shaft to drive the pulley on the opposite side.
A rifle bolt knob turning/threading fixture turned and milled from 4130 barstock:
and to fix the significant amount of radial and axial runout on my new Wangdong Chinese import collet chuck, a truing fixture:
I chucked up a piece of 4130 1.75 od, 1 id tubing, trued it to about .0005 runout, the turned it to the same specs as the inside of a 5C collet chuck. Then I put my chuck on it, cinched it down, and took a light facing cut on the back face of the chuck and opened the register out to a nice, concentric new larger diameter. then machined a backplate for it. Collet chuck runout is now smaller than my indicator can measure
Glenn
Love the work. Can you give some better shots of the tool rest? Clamp on ball-ends? Do they stay in place? Are they key?
Hallo, Glenn. That grinder looks fantastic. Congratulations. Might I also jump on the "more details please" bandwagon, please? I think it would be worth its own thread...
I'll try and snap a couple detailed pics of the table.
No keys, just two ball bearing joined (welded) to a round rod - ie... dogbone. I believe I used 3/8" flatbar with holes drilled for the balls to engage. These need to be thick so as not to deflect; I reef-down on that capscrew fairly tight, as the hardened chrome balls can slip. I also put a fairly large chamber on each hole to help provide more surface area for grip.
I'll try and snap a couple detailed pics of the table.
No keys, just two ball bearing joined (welded) to a round rod - ie... dogbone. I believe I used 3/8" flatbar with holes drilled for the balls to engage. These need to be thick so as not to deflect; I reef-down on that capscrew fairly tight, as the hardened chrome balls can slip. I also put a fairly large chamber on each hole to help provide more surface area for grip. But once tightened down, it really holds very well
What's not evident from the design photos below is that the magenta colored piece that welds to the under side of the table actually has a ball welded into the hole and centered. Like I mentioned, I'll try to snap some detailed photos for ya a bit later.
I snapped a couple screen shots of my table design - hope this helps some.
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