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02-15-2017, 8:26pm | #1 | ||||||
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Machined some teflon tubing today --videos in thread
I have eight pieces of teflon tubing to machine today for a repair on a dough roller. Each piece of teflon is 7-5/8" outside diameter with an inside diameter of 4-3/4" and came in at just over 17" long. I would estimate each piece of teflon would cost between $750 and $1000 each.
I need to cut them to a specific length and bore them to around 5-1/4" with a tolerance of +/-.004 After I'm done, four of them will get pressed onto a stainless steel roller and machined to a specific diameter. First two videos show the Daewoo 600 CNC lathe using a carbide cutoff tool to cut the tube close to finish length. Teflon is soft and distorts easily so I am holding in in "soft jaws". Soft jaws are steel and in this case, bored to a certain diameter to hold the teflon over the entire length. The hydraulic chuck is 24" in diameter and the jaws are made out of 3" square hot rolled steel, 14-1/2" long. It's spinning about 600 rpm same operation, slightly different view. the safety glass is designed to absorb an impact and a replacement piece was $750 about 12 years ago ( not I, a former coworker ) Now the end that was just cut off square is placed against the chuck. The machine is programed for "constant surface feet" so as it faces ( cuts ) and gets smaller, the RPM increases. The tool used can either face ( as shown ) or turn the diameter. I also put a countersink using a boring bar This is the final operation. The part is flipped end for end and faced to length. Then a very stout homemade boring bar is used to cut the inside diameter ( bore ) for a total length of 15-1/4" After each cut, I turned off the spindle and removed the chips so they don't jam against the boring bar and "do nasty things" ( like melt ) Teflon can be cut dry or with coolant. I cut it dry so I could video this for you folks |
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02-15-2017, 8:37pm | #2 | ||||||
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BORING !!!!
I always wondered how pipes were made. Now I know. |
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02-15-2017, 8:46pm | #3 | ||||||
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Neat to see some softer material get milled. I would never have thought teflon was that pricey.
Thanks for cutting dry so we can see what's going on. Scott
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02-15-2017, 8:59pm | #4 | |||||||
Barn Stall Owner #327
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Quote:
It got "turned" . From McMaster Carr. 7" od , 1" wall ( 5" id ) and 12" long is just under $580 https://www.mcmaster.com/#8556k97/=16depbk I usually have to run coolant and if the coolant turns on when you have the door open, it will soak your pants and shirt THRU to the skin in a second. It has a high pressure pump that will fill a 5 gallon jug thru a 1/4" line in well under a minute. |
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02-15-2017, 9:02pm | #5 | |||||||
Barn Stall Owner #17
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Quote:
So it would be accurate to say "you turned out some good work" Scott
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02-16-2017, 7:58am | #6 | ||||||
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[QUOTE=JRD77VET;1541068]I have eight pieces of teflon tubing to machine today for a repair on a dough roller. Each piece of teflon is 7-5/8" outside diameter with an inside diameter of 4-3/4" and came in at just over 17" long. I would estimate each piece of teflon would cost between $750 and $1000 each.
I have heard of rolling in dough, but never a dough roller.....so I got to ask.... I ASSume it's a machine in a bakery?? if so, what is the specs on the silly plastic doing so tight,?? seems to me that a hose and a hose clamp like on my car would do ok..... |
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02-16-2017, 8:33am | #7 | ||||||
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You got the coolest toys.
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02-16-2017, 10:34am | #8 | ||||||
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02-16-2017, 2:08pm | #9 | ||||||
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I'm guessing the scrap material doesn't stick to anything?
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02-16-2017, 3:34pm | #10 | ||||||
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02-16-2017, 8:15pm | #11 | ||||||||
Barn Stall Owner #327
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[quote=mrvette;1541134]
Quote:
The hose clamp might work for your own personal stuff but the Health Board mandates sterile surfaces. The hose clamp would have too many nooks and crannies. Quote:
The vertical mill has a contouring head. With that 4th axis, we can cut radial grooves or even threads. Here's a stainless steel roller I made for a pretzel bakery. The grooves are to put salt on the pretzels. No but it will wrap around the chuck pretty freaking fast. |
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02-16-2017, 8:19pm | #12 | ||||||
Barn Stall Owner #327
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Here's the roller in the lathe today. The roller is 5' long and finished at just under 6" in diameter. I adjusted the program to keep the diameter within .001 ( one thousandths of an inch ) over the entire length.
Just cell phone pics as I didn't take the camera today. |
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02-17-2017, 6:26am | #13 | ||||||
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Love this stuff!
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02-17-2017, 6:33am | #14 | ||||||
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02-17-2017, 8:03am | #15 | |||||||
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02-17-2017, 9:33am | #16 | ||||||
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02-17-2017, 11:48am | #17 | ||||||
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