Dovetail Cutter...Failed...

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tinkerer:
:nrocks: Just reading threads is instructional. Now I know what all of those things with steps are for. I have several of them and couldn't imagine what I could do with them. Now I know. :beer:

John Hill:
You get a nice blue star for effort Darren :thumbup: but I doubt I could have done any better myself!

I did think though that the chip was rather big for that application?

BTW, why are you making a dovetail cutter? Are you not one of the shaper fraternity? :D

Darren:
Indeed I am John.....indeed...... :)

Having failed to make a milling dovetail cutter ( I will come back to that at a later date when I have some more tips to try) I decided to go back to basics and fire Old Faithful up.

Instead of angling the head over to cut the dovetails as I did on "The Thing" http://madmodder.net/index.php?topic=908.msg6429#msg6429 I decided to use the same tip in a lathe tool holder I made some time ago http://madmodder.net/index.php?topic=963.msg7088#msg7088

I used the tool on the left in the shaper

Sorry for the poor picture

Note the groove in the centre, this is important to lessen the size of the cut to reduce chatter

And this is what it's all been about, to fix my parting tool to my QCTP

Did I ever mention how much I like using the shaper....... :lol:

bogstandard:
Nice job Darren, but if I could make a suggestion.

I have attached a c-o-c to explain things.

I suspect you have just bolted the two together. If so, no matter how many bolts you have used, the tool is liable to move under the cutting stresses.

If you just mark where the tool is sitting now, and machine a small recess (say 3mm deep) for a tight fit when the tool is bolted up, it will transfer the cutting forces to your toolpost rather than just the tool holding bolts.

John

Darren:
No bolting as yet John, it's just sitting there where I finished last night. I am a bit concerned about just bolting and rigidity and that's quite a bit of overhang.

I could just weld the bits together and be done with it, sure would be rigid then...... :lol:

I will follow your suggestion, or I may just cut a dovetail in the tool shank itself. The dovetail I made yesterday started out as just a bit of practice, but then I got carried away.............turned out ok really.

But I do have one prob with the shaper that I still have not resolved. It's to do with the return stroke on undercuts ie dovetails. On the tools return it lifts and damages the finish, quite badly in fact.

I'm thinking that I need to lock the clapper with undercut work......could anyone confirm this?

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