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I Forge Iron

Tooling arm question


Jeddly

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Hi, after doing some research, I decided to just build a KMG clone. The thing is closing on the backstretch, and I am having an issue with my tooling arm. I have used a wilton square wheel grinder before, and really like the interchangeability of tool rests and wheels/platens.

So, my arm is drilled and tapped at the end, a half inch hole for tools/wheels, and I slit the bar with a portaband. My problem is that the pinch bolt will not lock the half inch bolt I am goint to use for wheels and such.

After this failure, I decided to widen the gap with a cutoff wheel on my 4.5" grinder. Still no pinch.

Any idears?

Edited for pics cause everyone loves em.

Pinchnot.jpg
KMGClone.jpg

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Think about extending the slot beyond the spindle slightly as this may give more movement when you tighten the clamp screw, another alternative, clamp bolt fits direct onto spindle, (use a soft pellet between bolt end and spindle to help stop marring, or a flat on the spindle)

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The top portion of the pinch bolt hole is drilled oversize, compared to the threads on the lower portion.

I'll try the round bar deal this evening.

Thanks for the input fellas!!

Edit: Would the arm being 1080 have anything to do with it?

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Thanks John. I had not thought of extending the slit past the axle hole. It makes sense. I don't really gather what the soft pellet comment was intending though.


Soft pellet would stop the end of the securing bolt from marring the shaft it is clamping, so it will still slide easily in the housing.

If you lock a bolt up onto the shaft it usually marks it, by using the pellet/pad it damages that instead of the shaft
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Ah, like a sacrificial sleeve of sorts. I getcha.

The hole was driled with a 1/2" drill bit, and I forgot about the oversize business of bolts. I put a piece of 1/2" bar stock in it and seems to pinch better. After that I cut the slit past the hole another 3/4". Seemed to do the trick.

Thanks for all the advice guys. I appreciate it alot.

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