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Old 02-15-2017, 08:26pm   #1 (permalink)
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Cool 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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Old 02-15-2017, 08:37pm   #2 (permalink)
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BORING !!!!

I always wondered how pipes were made.
Now I know.
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Old 02-15-2017, 08:46pm   #3 (permalink)
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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.
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Old 02-15-2017, 08:59pm   #4 (permalink)
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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

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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Old 02-15-2017, 09:02pm   #5 (permalink)
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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.
Damn, that's a LOT of pressure.

So it would be accurate to say "you turned out some good work"
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Old 02-16-2017, 07:58am   #6 (permalink)
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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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Old 02-16-2017, 08:33am   #7 (permalink)
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You got the coolest toys.
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Old 02-16-2017, 10:34am   #8 (permalink)
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You got the coolest toys.


Jeff, just curious...do you have a 5-axis machine at your company?
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Old 02-16-2017, 02:08pm   #9 (permalink)
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I'm guessing the scrap material doesn't stick to anything?
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Old 02-16-2017, 03:34pm   #10 (permalink)
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I'm guessing the scrap material doesn't stick to anything?
The company is a Trump subsidiary.
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Old 02-16-2017, 08:15pm   #11 (permalink)
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[quote=mrvette;1541134]
Quote:
Originally Posted by JRD77VET View Post
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.....

Yes, a dough rolling machine for bakery. The tight tolerance is to make sure the teflon stays on the roller and does not slip or move.

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:
Originally Posted by Iron Chef View Post


Jeff, just curious...do you have a 5-axis machine at your company?
No 5 axis but all three CNC mills have a 4th axis. The two horizontal are indexers ( one is every degree and the other is every thirty seconds [ 1/2 degree] )

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.



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I'm guessing the scrap material doesn't stick to anything?
No but it will wrap around the chuck pretty freaking fast.
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Old 02-16-2017, 08:19pm   #12 (permalink)
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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.
Attached Thumbnails
Machined some teflon tubing today --videos in thread-teflon-1.jpg  

Machined some teflon tubing today --videos in thread-teflon-2.jpg  

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Old 02-17-2017, 06:26am   #13 (permalink)
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Love this stuff!
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Old 02-17-2017, 06:33am   #14 (permalink)
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Quote:
Originally Posted by Iron Chef View Post


Jeff, just curious...do you have a 5-axis machine at your company?
We just procured a 5-axis for my lab at work at the end of last year. Ran power to it last month and it's up and running now.
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Old 02-17-2017, 08:03am   #15 (permalink)
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Quote:
Machined some teflon tubing today
I duct taped my shoe yesterday.
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Old 02-17-2017, 09:33am   #16 (permalink)
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I duct taped my shoe yesterday.
Man has to know his limitations.
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Old 02-17-2017, 11:48am   #17 (permalink)
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Man has to know his limitations.
Because tying it would exceed so many limits.
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