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| Homemade Carbide Mill |
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| AdeV:
--- Quote from: vtsteam on August 29, 2013, 05:26:59 PM --- ... I remembered they were square in shape -- and realizing that wasn't ideal. A diamond shape is what I will look for in the future ... --- End quote --- Erm, if you rotated the tip 45 degrees, you'd have a diamond shape shurely? In fact, you wouldn't need to do anything like 45 deg; 10 degrees would be plenty, that would reduce the cutting area back to just the tip - yes, you'd have to choose whether your tool cut on the bottom face or the outer face. The advantage of using square tips is you have 4 cutting corners - great if you have a habit of smashing the tips up like I do... |
| sparky961:
That looks like a respectable enough cut. |
| vtsteam:
--- Quote from: AdeV on August 30, 2013, 09:14:33 AM --- --- Quote from: vtsteam on August 29, 2013, 05:26:59 PM --- ... I remembered they were square in shape -- and realizing that wasn't ideal. A diamond shape is what I will look for in the future ... --- End quote --- Erm, if you rotated the tip 45 degrees, you'd have a diamond shape shurely? In fact, you wouldn't need to do anything like 45 deg; 10 degrees would be plenty, that would reduce the cutting area back to just the tip - yes, you'd have to choose whether your tool cut on the bottom face or the outer face. The advantage of using square tips is you have 4 cutting corners - great if you have a habit of smashing the tips up like I do... --- End quote --- Yes, but unless I'm visualizing it wrong, then you can't cut to a shoulder. Don't you need bottom relief, as in an end mill? I could re-grind the tips to add that relief, though. I have a new green wheel in a box.... |
| AdeV:
--- Quote from: vtsteam on August 30, 2013, 11:19:36 AM --- --- Quote from: AdeV on August 30, 2013, 09:14:33 AM --- --- Quote from: vtsteam on August 29, 2013, 05:26:59 PM --- ... I remembered they were square in shape -- and realizing that wasn't ideal. A diamond shape is what I will look for in the future ... --- End quote --- Erm, if you rotated the tip 45 degrees, you'd have a diamond shape shurely? In fact, you wouldn't need to do anything like 45 deg; 10 degrees would be plenty, that would reduce the cutting area back to just the tip - yes, you'd have to choose whether your tool cut on the bottom face or the outer face. The advantage of using square tips is you have 4 cutting corners - great if you have a habit of smashing the tips up like I do... --- End quote --- Yes, but unless I'm visualizing it wrong, then you can't cut to a shoulder. Don't you need bottom relief, as in an end mill? I could re-grind the tips to add that relief, though. I have a new green wheel in a box.... --- End quote --- You're right, you need a tip angle of less than 90 degrees to cut to a corner.... they'd be good on a lathe tool though, those square tips. Triangular would be better for your application? |
| sparky961:
We use a lot of tooling that takes 80 degree Trigon inserts. Because of the angles involved, they're quite versatile. Look for "Wxxx". The others I see a lot for milling are the parallelogram inserts, "APKT" comes to mind. "CNMG" (80 degree diamond) can be very useful as well, and you can often use all 4 cutting points/edges in a well designed tool. |
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