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Pilot Plant Supervisor

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Posts posted by Pilot Plant Supervisor

  1. We have always used Micro 100 single point thread mills in infiltrated Tungsten, and Titanium, cutting top down G03 (conventional cut) with no problems. We cut right to size, but usually take a spring pass or two. I can't remember offhand, but I think SFPM is around 150 and only around .0002" chip per tooth.

  2. We had several issues with our screw a while back. Our backup compressor is a piston and is piped from another building around 100yds. away. Usually, the backup is only used when doing PM on the screw, but with our breakdown, we were on the piston for a couple of months. I didn't think about the backup compressor not being plumbed through the air dryer, and we are still paying for that mistake. Air bearings on CMM suffered, had to rebuild the drawbar cylinder on a horizontal, lift cylinder on the saw, ect...

  3. We have the Burr King Model 15 with filterpak 4001 http://www.burrking.com/catalog/p-100028/model-15-vibra-king-medium-bowls-combi-paks-1.3-cubic-feet . We are using ceramic angle cut cylinders (ACC50A) for media, and BKS-60 solution. the parts vary between 4" and 10" long and roughly 1/4" cross section. Basically Swizzle sticks. We tested some parts in a model 45 Vibra King chamber, but did not get good results with this particular family of parts.

  4. I've had that problem with Haas machines if I didn't have the smoothness settings right. The roughing cutters over-ran and left gouges in the part that wouldn't clean up with the finish tool. There are settings in the Haas control to allow for acceleration/deceleration, but if set too loose (so the machine runs smoother), can overcut if you are not leaving enough stock.

  5. I couldn't wait for Stevens either. My tooling vendor suggested http://www.durusworkholding.com/menu/ and they were able to deliver in 2 weeks. They make the fixed jaw just like Stevens to go with the modular vise. The main difference is, instead of dowel pins, the Durus vise has two .625 buttons that protrude .065" from the base, so the subplate has to be counterbored. If I had a Stevens subplate, I'd make some step dowels instead of counterboring.

  6. I don't think I'd be at all interested in that task even with cut resistant gloves. How about a suction tube positioned near the tool tip?

     The chips will not break no matter what you do. We have had some limited success with Cryogenic machining to get the chips to break, but are still in the testing phase. It is definitely a dangerous situation, but we have developed processes to deal with it the best we can. Specialty alloys are a different beast for sure!

  7. I agree with the no gloves around spindles rule for the most part, but there are exceptions. We work with many refractory metals that require chips to be removed as a continuous string when lathe turning. As you can imagine, the chips are like razor wire, so we use many different kinds of cut resistant gloves depending on the material and operation. I haven't found any that will keep chips out, but I would suggest something that has a rubber coating that might help repel the slivers. Take a look at various cut resistant gloves such as G-Tek 3GX. There are many gloves similar to this, and I'm sure there's something that would provide some measure of protection. Might be time to contact your safety supplier and see what they can offer.

  8. We have an Icefly unit from Industrial Cryotec. It's not as sophisticated as the 5ME, but it is much cheaper. Kind of apples to oranges though. The 5ME system uses low pressure nitrogen at around 30 psi, and cools the cutting tool from the inside. The Icefly system uses nitrogen at around 150 psi and sprays the liquid nitrogen right on the tip of the cutting tool. We have only used the Icefly for O.D. turning, and we are using Sandvik tool holders that have the coolant through ports built in. You have to get creative with Teflon tubing to insulate the tool holder the best you can so that the nitrogen remains liquid.

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