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Old 11-09-2020, 02:52 AM
threepiece threepiece is offline
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Default Unusual Fly Cutter

I found this at the scrap yard recently. I think it was intended for use in a hand drill, probably electric boxes. I have not tried to adjust it but it looks like the two cutters are secured with one set screw. I guess it would be tricky to adjust.
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Old 11-09-2020, 12:16 PM
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LKeithR LKeithR is offline
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Tools like that can be set so one cutting edge is cutting a little deeper or a little wider than the other.
You get twice the amount of material removal for each revolution without overloading the tool. Still,
I've never been a fan of flycutters in hand-held drills. It's hard to keep them square to the workpiece
so they don't grab or cut oversize, especially when cutting larger holes. If that's all you've got they'll
work OK but, given a choice, I'd always grab a holesaw before one of these...
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Old 11-09-2020, 02:25 PM
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Dave Lee Dave Lee is offline
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I have a couple of similar cutters except, mine have 3 bits. They work great in a Bridgeport. You take a pair of dividers and scribe a circle of your desired sized hole.

Then, drill a hole for the pilot. Put the cutter in the mill, loosen the set screw or screws in my case and adjust the knee or quill up and down until the cutters land exactly, on the inside of the scribed circle. Then, have at it.

I cut two 4 inch holes through a 1 inch die block and the clearance holes through the die set and the stripper plate. It would have been a PITA using other methods.

I should mention that the die holes were finished to size with a boring head. The hole cutters saved a lot of time with the roughing in.

Dave
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Old 11-10-2020, 07:46 AM
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randydupree randydupree is offline
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Quote:
Originally Posted by threepiece View Post
I found this at the scrap yard recently. I think it was intended for use in a hand drill, probably electric boxes. I have not tried to adjust it but it looks like the two cutters are secured with one set screw. I guess it would be tricky to adjust.
i think this tool is used on automotive cylinder heads,the pilot follows the valve guide.
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