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Dovetail Cutter...Failed...

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Darren:
This project failed...but I thought I'd post it anyway. To put it simply I was pushing the boundaries a tad too far, but I was trying to work with what I had and it was a good practise run anyway. Can't win at everything can we..... :)

I'll let the pictures do most of the talking......





Used the RT to set the angle, here I'm squaring up the collet block with my indicator to set the RT to zero.









You can see I was struggling a bit to get it all to fit in the slot...



Instant disaster and I barely kissed it.......... :lol:



Like I said, I knew I was pushing it from the start, but heck, gave it a go anyway. Basically the tip was too large for the slot I was trying to cut. Larger dia bar with more meat left on it to support the tip would probably have worked. But then it wouldn't have fit the slot. I'll try a smaller tip next time, or make a bigger dovetail...... :med:

jim:
did the tip have clearance for the back edge?

just a thought :scratch:

sbwhart:
Darren:-

That may have worked if you hadn't under cut the holder, if you look at the last but one pic you can see where you can have more meat in the holder.

With a dove tail cutter you really load the cutter by using its full length to take the cut, not like a spiral end mill cutter, where is takes the cut progressively in a slicing action, thats why you need to take small cuts and keep the tool as strong as posable.

Good luck

Stew

Edit:- Just read Jimmy's reply and he's correct you need to back the tip off.

Stew

websterz:
A little positive criticism Darren? The problem is two-fold. The insert you chose and the depth of your pocket (on the cutter, not your breeches) are to blame. By putting the cutting edge on center as shown you leave the backside hanging out further than the cut, that's why it hung and twisted off. You need to use a TCMT style insert:

http://www.carbidedepot.com/SearchResult.aspx?CategoryID=2801

That's how I built my inserted dovetail cutter and it works great! With the wider cutting face you can put the cutting edge on center and still have clearance so the heel doesn't rub. Even better is to put the centerline of the insert on the centerline of the cutter, splitting the difference gives better clearance and still acceptable performance.

Darren:
Thanks Guys, I knew there was a good reason to put the post up, never gave the back edge a thought...... :doh:

Dunno why not....... :smart:

I'll try to get some different tips, smaller ones too so the holder is left with more meat on it ( a lot more) and have another go...... :thumbup:

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