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Is your 3-D printer lonley, neglected, bored and in need of a project?
- Thread starter YYCHM
- Start date
Richard Tymko
Active Member
I have two! What’s On your mind? Is it designed?
Not designed in detail, just in concept. I don't have the CAD/CAM knowledge nor the S/W to product the G-CODE.
The idea is this..... A cradle with the appropriate angles (usually two) that you could place the HSS tool blank in and then push the cradle against a fence that's mounted on the grinder at a right angle to the wheel. Then pass the tool blank back and forth across the grinder wheel controlling the blank pressure by hand. You would need 3 such cradles to grind a typical right hand turning tool.
So in my example. One cradle would maintain end cut angle and end relief. A second cradle would maintain side cut angle and side cut relief. The third cradle would maintain back rake angle and side rake angle.
Something like this....
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Ya, just edit and select an image. You should see a delete popup under it. You might have scroll down to see the popup.
Richard Tymko
Active Member
I can see your idea working and using 3D printing for prototyping but I can see the plastic breaking down quite quickly. Aluminum would work. Do you have all the angles and specs for the concept?
I working on some sketches. So you don't think the PLA or whatever it is would last? I agree aluminium would be better but some of the angles required would be a real challenge to make on a manual mill.
Richard Tymko
Active Member
I think printing it would be a short term solution, between back and forth rubbing and heat creep, I can see ABS not lasting long. Maybe a metal base rather than plastic might help a bit? I can see it being milled on a 5 axis?
DPittman
Ultra Member
The second one is sort of close. Are you grinding them on a bench grinder? Is your jig angled in two planes?
DPittman
Ultra Member
Yes and yes
An easy way of accurately orienting things at angles is just using pins sitting in a drilled hole. You might get a lot more useful setups with different pin/hole combinations on the same aluminum fixture plate. Milling all that material just to get a back stop doesn't really accomplish a lot in my mind. You can slide the cutter along the pins the same as a slot unless its very short. Also most end mills have some kind of radius so your HSS blank may not even butt up against the slot side without a bit of file dressing or relief in the corner.
Then for clamping, something like what DPittman shows looks fine to my eye. As long as you have some way of feeding this assembly into a grinder in light stroking passes vs set & plunge mode,
Then for clamping, something like what DPittman shows looks fine to my eye. As long as you have some way of feeding this assembly into a grinder in light stroking passes vs set & plunge mode,
Attachments
Not following the pin thing Peter?
? The milled relief sets up two angles that can be repeated. The cutting edge angle and the relief angle.
