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| Brass_Machine:
Hi Baron, Those look pretty stout. How do they cut? Eric |
| BaronJ:
--- Quote from: Brass_Machine on March 01, 2014, 09:05:03 PM ---Hi Baron, Those look pretty stout. How do they cut? Eric --- End quote --- Hi Eric, Do you mean my fingers or metal. ;-) It really depends on the toolbit shape and angles. I did some tests with a semicircular tip on BMS and got good results, on cast iron just have a look at the second fly cutter pictures. I found that a sharper edged toolbit seemed to be better on aluminium and a much higher speed around 1000 rpm. I did try an uninterupted cut of 0.5mm on a piece of black plate, fairly low speed but found that the mill struggled quite a bit. A learning experience really, discovering what the mill was capable of without pushing it too hard. |
| BaronJ:
Hi Guys, Here are the rest of the photographs as promised of the second fly cutter. You can see a couple of mistakes that I made along the way, though neither affect how the cutter functions. They seem quite rigid since the shaft goes completely into the collet or drill chuck. |
| BaronJ:
--- Quote from: rick barnes on March 01, 2014, 06:57:08 PM ---I was thinking of making a head I can attach to my Taig slitting arbor. Then I just have to make the disc. I should start a list of what to make, so I quit forgetting what I need when I get in the shop. --- End quote --- Hi Rick, I would be a little cautious about using an existing arbour. The first one shown has the 16 mm silver steel shaft turned down to form a shoulder, the spigot of which is a good press fit into a 1/2" inch hole drilled in the disc. Also the disc of this one is a bar end offcut of 314 stainless steel. Which is why I avoided trying to thread a large hole in it and used a press fit. This stuff work hardens if you look at it the wrong way. Drilling the smaller holes wasn't too bad, but you have to keep the drill cutting. The hole for the grub screw tapped easily. If I were going to make another I would definitely go for BMS or cast iron for the disc. I also would drill a second hole for a toolbit 10 or 15 mm further in. Then I would drill and tap the grubscrew hole right through both. This fly cutter was designed to cut a 65 mm diameter surface and it would have been useful to have a second tool position for a smaller diameter. |
| rick barnes:
The diameter is about 30mm, so it's pretty small. Is there a danger in the existing arbor, or a accuracy problem? |
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