UHMW Tubing or Pipe? | Page 2 - Practical Machinist
网页2014年10月13日 · The lathe is indeed small. 2" is not the finished size. It has 4 diameters. The end is 2.125"(1/4" width) then it steps up to 2.4" for another 5/8" length and then 2.7 for the remainder minus 1/4" that is 2.875. Most of the part is 2.7" or bigger so thin wall comes into play. At UHMW to that mix and well, lol, you get the idea.
CNC Machining | UHMW Tubing or Pipe? - Practical Machinist
网页2009年4月27日 · I am trying to find some 3.125" od with a 2" id UHMW and my supplier is saying they don't have tubing. You can only get plate or solid round bar. I waste quite a bit of material doing them from solid bar and of course more time as well.
looking for experiences with uhmw shrinking after time.
网页2009年10月21日 · The shrinking may be doing this for you. However, the parts they are molding also expand at that temperature so the cavity sizes need to be adjusted based on the difference in coefficient of thermal expansion for the molded material vs the mold material. UHMW coefficient of thermal expansion: 140ppm per Celsius degree (78ppm per Fahrenheit degree).
tolerances for plastic (UHMW/PTFE) slide bearings...
网页2017年1月14日 · In my experience Aluminum 6061 tubing does not form a good wearing pair with UMHW, a much better wearing pair is 7075 tubing and acetal. Same goes for PTFE, unless your sliding speeds are very low and/or cyclic rate is measured in dozens of times per hour you will have very poor wear performance.
Using UHMW for sliding bearings - Practical Machinist
网页2009年8月1日 · The UHMW has a very good low-friction characteristic, but it is softer than the Delrin AF. Obviously, what is in hand is much more attractive to use. As Lily Sami noted, Nylatron would also be a good choice, however, I note that you are in Texas, and it is possible that the humidity absorption of nylon-based materials might be a caution for any ...
Plastic Tubing having standard ID sizes? - Practical Machinist
网页2018年11月19日 · We made our liners out of 4130 tubing with aluminum donuts slid over the tubing and secured with set screws, and orings in grooves around the donuts to keep them in the drawtube. .058 (or .049) wall 4130 is pretty light and the ID is just a few thou. over standard sizes so it fits round stock real closely.
General | Bonding UHMW to steel - Practical Machinist
网页2010年5月28日 · I was wondering if anyone has experience bonding UHMW to steel. I want to attach .25" thick UHMW sheets to the exterior sides of a 12" length of 3" square tubing. which will be reciprocating inside a section of 4" square tubing. The back and forth stroke is about 10" and it runs at 37 strokes per minute.
CNC Machining | Uhmw turning - Uhmw turning | Practical Machinist
网页2021年1月26日 · The only other thing I can add is that very directed coolant can shoot the chip stringer against the bed of the machine. I use copper tubing to bend up a loop to shoot coolant in front of the tool tip towards the bed of the machine. I hate UHMW. I'd rather turn 304 SS. But if you spend enough time tweaking it, you can get a fairly reliable process.
General | Bending thin-walled 4130 - Practical Machinist
网页2016年4月19日 · I have a personal project requiring a few bends in some 4130 tubing using my manual bender; 2" and 1-5/8" ODs, both are 0.049" wall, 15<60 degree bends, and both dies have a 7" CL radius. I have tried several methods and am wondering if there are any others left to test.
Threaded inserts in UHMW and best screw heads for lexan
网页2007年11月2日 · The pieces that get fastened to the UHMW are 1.25"-1.5" wide pieces of 1/2" Lexan. My customer's staff will be changing these Lexan pieces on a regular basis. I had originally planned on flat socket head screws to hold the lexan down but I am second guessing myself as I am concerned someone will over …