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In The Shop Shop talk, shop tools & fixtures, shop wear, anything for the shop that is not covered in another forum.

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Old 06-15-2016, 12:42 PM
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TheBandit TheBandit is offline
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Carbide Burrs?

This weekend I installed a hitch receiver on my daily driver. Part of the install involves modifying an existing 1/2" diameter hole to create a slot shape for fishing carriage bolts and spacer/washers through the existing frame rails. The install called for the shape depicted below:



The Dremel seemed to be the only tool that fit in the space and I decided to try the "high speed cutter" tools that it came with (link here). I have no experience with this type of cutter, but it seemed to work great at first. Unfortunately, they didn't last very long and stopped cutting, so I finished the job with some a grinding stones on the same tool which cut much more slowly.

Is a cutter like this the right type of tool to do what I was doing? If so, could I expect a carbide burr to last longer than few small slots? I'm thinking I'd like to have something like this on hand in the future and any tips for tool/cutter selection/use would be greatly appreciated!
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Old 06-15-2016, 03:27 PM
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You need Carbide not Steel...
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Old 06-15-2016, 06:26 PM
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That's what I'm figuring, but also want to make sure this is the right tool and that I'm using it correctly. You have to remember I am at a 4th grade fabricating level. Speak slowly and use small words.

Also regarding your signature:

Quote:
Originally Posted by entropy's signature
When you become dead, you do not know that you are dead.
Thus your being dead is only difficult for others.
It is exactly the same when you are stupid.
Some people (like me) are just smart enough to know they are stupid, and that's more painful than being smart or stupid. Ever read Flowers for Algernon?
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Last edited by TheBandit; 06-15-2016 at 06:29 PM.
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Old 06-15-2016, 06:42 PM
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Wink

Quote:
Originally Posted by TheBandit View Post
Also regarding your signature:
Some people (like me) are just smart enough to know they are stupid, and that's more painful than being smart or stupid. Ever read Flowers for Algernon?
Ah, yes.
Yes, in deed I have!
I have not only read the script, but I have trod the boards decades ago...

E
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Old 06-16-2016, 07:38 AM
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I agree with E on this one, you really need carbide. With the speed involved in grinding, it will dull/burn HSS pretty quick in steel. McMaster has a pretty decent selection of burs if you're only buying one or two.
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Old 06-16-2016, 09:30 AM
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CarterKraft CarterKraft is offline
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I really despise the dremel tool. I am far too neanderthal to use a dental tool on steel.
The small air die grinders are really cheap and with a small selection of burrs you can really smoke through some metal, covering your floor with microscopic razor blades.

Something like the 337-0045 $36.50 and some 317-0269 cylindrical end cutters 3/8 dia are pretty universal for my uses. You can add different bits as needed.

note: you could substitute the enco grinder for a HF unit $11.99 but I think you know the drill on the HF tools.
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Old 06-16-2016, 10:50 AM
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The way to do this is In My Opinion: to drill the ends of the cross slot with the appropriate drill bit; then cut the remaining bit of metal out with a body saw.
If there is enough clearance to get the tools in there.


E
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Old 06-16-2016, 12:02 PM
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Quote:
Originally Posted by entropy View Post
The way to do this is In My Opinion: to drill the ends of the cross slot with the appropriate drill bit; then cut the remaining bit of metal out with a body saw.
If there is enough clearance to get the tools in there.


E
Good thinking. Unfortunately the image is not to scale; the hole is a lot closer in diameter to the overall length of the slot, so there is no material to center a drill on. I suppose I could have made a series of very small holes, but the job is done now. I just want to make sure I have the right tool on hand for the next time I face this kind of situation.

Thanks for the tips!
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