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22nd Feb 2022, 06:21 PM #1Senior Member
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End mills with guide - do they exist
I’m not sure what to call them but am wondering if there are end mills that are set up like a trim router where there is a bearing on the end to allow a piece to be presented and trimmed around? I’d like to use this to chamfer a range of materials and couldn’t find such a tool but maybe I just don’t know what to call it? I guess another option would be a piloted end mill and then buy or make a pilot larder than the diameter of the end mill?
Any suggestions on these and if they exist?
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22nd Feb 2022, 07:00 PM #2Most Valued Member
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Something like this ?
https://www.youtube.com/watch?v=Ak747RzFUa8
Steve
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22nd Feb 2022, 07:06 PM #3Most Valued Member
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Hi there,
I know what you mean but I'm not sure if it can be done the same way on a mill.
Moving the mill table x and y by hand in order to trace a template would not be easy. Cutting forces would make it difficult to "feel" when the bearing is up against the template.
I could be wrong. Interested to hear from others...
Edit: well bugger me! There you go!!!
Simon
Sent from a galaxy far far awayGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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22nd Feb 2022, 07:17 PM #4Most Valued Member
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Have heard of people (Baron J, I think?) using a woodworking carbide router bit, should be OK providing small cuts were taken.
HTH
KrynTo grow old is mandatory, growing up is optional.
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22nd Feb 2022, 07:18 PM #5Most Valued Member
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End mills with guide - do they exist
Maybe if you attached one of those chamfering tools on a spring loaded mount somehow it could be driven roughly around the outside of a part with the mill and the spring would keep it in contact with the part??
Steve
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22nd Feb 2022, 07:53 PM #6Most Valued Member
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I regularly use 1/2” shank router bits to machine ally, I have used carbide router bits to cut steel, but honestly, it’s sub optimal, it’s slow, all the geometry is wrong so it can be quite violent if you get greedy with DOC and it’s really easy to chip the carbide if you aren’t paying attention
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22nd Feb 2022, 09:05 PM #7
Hi Guys,
Yes ! Carbide router bits are very useful for jobs like this. There are only two caveats, the one on 1/4" inch shafts need to be used with care ! It is very easy to bend the shaft and then you are in all sorts of poo. The other is that they need to be run quite fast, some mills can't run fast enough. Depending upon the material I run from about 1000 rpm up to the mills maximum at 2500 rpm. In steel, high speeds and small cuts ! You soon get to know if the cutter is happy. For a lot of jobs I take the small bearing off, though I found that that with the bearing on its easy to bend the shaft.
The 1/2" shaft ones are the very good ones !
HTH.
Just a quick edit ! Often you cannot see the bearing turning, so I paint half the rim with red marker.Best Regards:
Baron J.
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22nd Feb 2022, 09:11 PM #8Senior Member
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22nd Feb 2022, 09:13 PM #9Senior Member
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22nd Feb 2022, 09:31 PM #10
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22nd Feb 2022, 09:44 PM #11Most Valued Member
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I can vouch for that from very similar personal experience.
When I was younger and even more stupid, I mounted a router in the vice upside down with a ball bearing rounding bit in it.
Proceeded to round some short bits of timber until the inevitable ZING…..that’s going to smart once my nerves catch up…..as the side of my thumb went through the bit when the timber grabbed.
Steve
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22nd Feb 2022, 11:10 PM #12Most Valued Member
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Even with one of those pneumatic chamfer tools you need to be switched on. Aside from the fact they hurl metal splinters at you constantly, at some point you wind up climb cutting with them and it gets interesting if you don’t keep your wits about you.
I used to have one until I dropped it and cracked the housing.
Having said that, they do work very well for putting a small bevel on parts.
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23rd Feb 2022, 08:35 AM #13Senior Member
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Thanks guys - I’ll definitely change my approach - I’d like to keep my fingers
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