Could you not have put a roller support (or two) behind the tool. That would make it more secure. Also one can jury rig couple of long bolts to pull the job tight?
Hey Jack, Sorry to say, but you don't cast Teflon. It starts as powder, in a mold, heat it up, put lots of pressure on it. Wait. Heat up again, following a pattern. Do not heat above 427 degrees C. En als je wilt voorkomen dat je materiaal er af komt... Plak het met loctite 770 primer en secondelijm op een stuk PVC. Voorbeeldje staat op mijn kanaal. Ik heb een poosje in de kunststoffen business gewerkt.
Years ago, I saw a machinist, who had worked on the Manhattan Project, machining Teflon. He cooled the Teflon with liquid N2 to make it harder, so it would cut like a hard plastic. I don't know if it was the same formulation of Teflon that is available today. It was very soft and slick prior to the liquid N2.
Reminds me of a job I did for my school. I bored out magnesium alloy housings which were to be used to cap the school's light poles and hold the actual light fixtures in place. They never chucked up true and the material defies turning- it always came out rough and the operation itself was very hard on the tooling.
I have a size of some virgin teflon I would have to take some measurements for accurate size but I KNOW it's 13" long of some I THINK 14.85" OD X 12" ID
would you have a need for it? I don't and it's just setting around my shop!
As a guy who works on this material every day, let me put a couple o' things straight.
If it's pure teflon, straight from the oven (powder pressured in molds with up to 600 Bar), it's on the soft side of plastics - it can draw a clean 'string' with zero problem. I will suggest you put up longer claws - can take a much larger beating. We usually do 2000 rpm, feed=0.10 mm pr. revolution. can take 0.20 or more easy, but the surface ruffles a bit. (our 0.10 standard is purely for surface quality)
Yes, the teflon was cast material and cost $800 dollars a piece, that's why we do it slow and we cannot afford to scrap one of them, Holding it on less tahn 1/2" into the jaws and sticking out 14-15" is long.
It was slow but we got paid for 2 good parts, thats all that counts.
Is the raw material a cast pipe (dont know the exact english phrase, im from denmark)? Thinking of why the hole isnt alligned with the outer diameter :) I've turned something just like this, some sort of cast pipe, but it was made of PET and also, just like this, wasnt alligned properly :)
Teflon huh? How is it to machine? Brittle? Soft/gummy? I have to make refractory ceramic casting tools out of UHMW polyethylene quite often and it's a bear to learn, but pretty easy once you get the hang of it.
I've machined a couple of pieces of teflon and thought it was pretty nice to cut, not nearly as bad as UHMW. It actually sort of cuts chips (you can hear it in this video) rather than plastically deforming the material into "strings".
@ryobiguy Whaddya know...I've changed jobs and we use teflon quite a bit. Most of it 1" or smaller dia...some milling on square bar stock as well. It is pretty nice to work with, I don't mind it.
Yes, you should run the part at like 2000 surface feet, but it is smart to run it slow. The few times I have had parts come out of the chuck was with plastics like polyurathane and vespel. It sucks when you have to stop working for a ct scan!
The teflon was similar to cast, so not perfectly round, both the Inside and outside
diameter must be concentric, thus cut at the same time before removing the tube,
because gear teeth will be put on the outside diameter afterward, so concentricity
is a must. Anyway i got paid for the job that is what matters to me, so the part is good.
jackshop 5 months ago
Could you not have put a roller support (or two) behind the tool. That would make it more secure. Also one can jury rig couple of long bolts to pull the job tight?
azzy314159 5 months ago
I love machining Teflon, problem is if you stand too close when your finished you look like a cum shot :(
GeneralG1810 7 months ago
Hey Jack, Sorry to say, but you don't cast Teflon. It starts as powder, in a mold, heat it up, put lots of pressure on it. Wait. Heat up again, following a pattern. Do not heat above 427 degrees C. En als je wilt voorkomen dat je materiaal er af komt... Plak het met loctite 770 primer en secondelijm op een stuk PVC. Voorbeeldje staat op mijn kanaal. Ik heb een poosje in de kunststoffen business gewerkt.
Serrie1976 9 months ago
Very interesting, I usually freeze rubber in dry ice to make it cold and harder.
The teflon cut good only thing is, it was cast and i only had 1/2 inch to hold it
in the jaws of the lathe, biggest fear was if it come out of the jaws.
Jack
jackshop 1 year ago
Years ago, I saw a machinist, who had worked on the Manhattan Project, machining Teflon. He cooled the Teflon with liquid N2 to make it harder, so it would cut like a hard plastic. I don't know if it was the same formulation of Teflon that is available today. It was very soft and slick prior to the liquid N2.
BuickDoc 1 year ago
This has been flagged as spam show
Reminds me of a job I did for my school. I bored out magnesium alloy housings which were to be used to cap the school's light poles and hold the actual light fixtures in place. They never chucked up true and the material defies turning- it always came out rough and the operation itself was very hard on the tooling.
douro20 1 year ago
Comment removed
douro20 1 year ago
I have a size of some virgin teflon I would have to take some measurements for accurate size but I KNOW it's 13" long of some I THINK 14.85" OD X 12" ID
would you have a need for it? I don't and it's just setting around my shop!
get back with me if you're interested...
PimpXXXGuitarist 1 year ago
i machined teflon for 15 year try turning it faster and use high speed tooling
william7040 1 year ago
@william7040 yup... I have a few years of machining teflon and HSS is always the way to go...
PimpXXXGuitarist 1 year ago
I love machining teflon but it makes you look like a prono cumshot when youve finished
GeneralG1810 1 year ago
As a guy who works on this material every day, let me put a couple o' things straight.
If it's pure teflon, straight from the oven (powder pressured in molds with up to 600 Bar), it's on the soft side of plastics - it can draw a clean 'string' with zero problem. I will suggest you put up longer claws - can take a much larger beating. We usually do 2000 rpm, feed=0.10 mm pr. revolution. can take 0.20 or more easy, but the surface ruffles a bit. (our 0.10 standard is purely for surface quality)
tdjdk 1 year ago
Comment removed
tdjdk 1 year ago
Yes, the teflon was cast material and cost $800 dollars a piece, that's why we do it slow and we cannot afford to scrap one of them, Holding it on less tahn 1/2" into the jaws and sticking out 14-15" is long.
It was slow but we got paid for 2 good parts, thats all that counts.
jackshop 2 years ago
Is the raw material a cast pipe (dont know the exact english phrase, im from denmark)? Thinking of why the hole isnt alligned with the outer diameter :) I've turned something just like this, some sort of cast pipe, but it was made of PET and also, just like this, wasnt alligned properly :)
Mitsugejl 2 years ago
yes it was cast pipe, thats why it cost $800
per piece and i could not afford to lose this part, if it came out of the chuck.
Jack from Eindhoven Holland.
jackshop 2 years ago
Teflon huh? How is it to machine? Brittle? Soft/gummy? I have to make refractory ceramic casting tools out of UHMW polyethylene quite often and it's a bear to learn, but pretty easy once you get the hang of it.
caulk04 3 years ago
I've machined a couple of pieces of teflon and thought it was pretty nice to cut, not nearly as bad as UHMW. It actually sort of cuts chips (you can hear it in this video) rather than plastically deforming the material into "strings".
ryobiguy 2 years ago
@ryobiguy Whaddya know...I've changed jobs and we use teflon quite a bit. Most of it 1" or smaller dia...some milling on square bar stock as well. It is pretty nice to work with, I don't mind it.
caulk04 1 year ago
Yes, you should run the part at like 2000 surface feet, but it is smart to run it slow. The few times I have had parts come out of the chuck was with plastics like polyurathane and vespel. It sucks when you have to stop working for a ct scan!
jimmydingles 3 years ago 2
neat, what is it for?
O1toolsteel 4 years ago
It's a gear that rotates, don't know what it
does, I just know there gear teeth on the ends 360 degrees around.
Teflon was $800 dollars.
Not a money maker.
I can send a solid model of it for anyone
that leaves me an e-mail.
jackshop 4 years ago
Rough piece? Concentricity is a joke!
Rigel66 4 years ago 2
Indeed, the cutting tool appears not to have been pre-aligned with a centre hence the regular intermittent cutting noise.
The RPM also seems too slow for the cutting diameter and softness of the work material.
sonicstep 4 years ago
This is a cool video. I bet that piece of material cost a small fortune :-)
AmericanFabricator 4 years ago