Here is a followup, from Sherline. I am still in the middle of a steep learning curve. The tool came installed in the fly cutter, I am not sure why a thread cutting tool came on it….
It sure is nice having a VERY responsive Customer Service department in California rather than China…. From the VP, no less!
John Davies
Spokane WA
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I apologize, I was reading your email from my cell phone and I didn’t see the link to your Henry Rifle Forum. A couple things.
1. All plastics, nylons, etc. have this problem.
2. Fly cutting any of these materials is the worst scenario. If you were doing any other machine operation the static chip problem will not be so overwhelming and your shop vac will be capable of removing the chips easier.
3. You may try using Polypropylene instead of acetal and see is the static problem is less intense.
4. After looking at your forum post, it look like you are using a 60 degree brazed carbide tool in your fly cutter.
A. The 60 degree tool is the wrong tool to use. The 60 degree tool is for cutting threads.
B. The 60 degree tool is also in the wrong orientation. The carbide cutting surface should be facing to the left as you look at the picture (turn it 90 degrees). Read the fly cutter instructions (3052inst.pdf (sherline.com)). Note that the cutter in the instructions is a left hand brazed carbide cutter and it is also being used to cut metal, not plastic.
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C. For acetal and other plastics High Speed Steel cutter work better and give a better finish.
D. Try using one of our P/N 11960 Left-Hand High Speed Steel Cutting Tool. You will need to hand grind the cutting corner so it has a radius instead of a sharp point as shown below. The blue radius shown below is the cutting edge which should be facing down when it is in the fly cutter.
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If you use a tool like this, the cutting edge will scoop the material off of the part like an ice cream scoop does on ice cream. Your chips will be bigger and the static effect should be less.
Using the cutter that you have (in the wrong orientation), you are rubbing the material off of the part instead of cutting the material off. Rubbing increases the static effect.
Please do me a favor. If you follow my instructions and you achieve better results and a better part finish. Please post this information on your forum so others can benefit. J
Have a great day,
Karl Rohlin
Sherline Products Inc.
3235 Executive Ridge
Vista, Ca. 92081
Vice President of Manufacturing
Pho (760) 727-5857
Or (800) 541-0735
Cell# (951) 553-8912
Fax (760)-727-7857
karl@sherline.com
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