Cryogenic machining: Custom rubber parts----make money online

today on Applied Science I'd like to

talk about an interesting manufacturing

technique to create custom rubber parts

so here's the end result of this process

it's basically just a piece of black

rubber neoprene I think and as you can

see it has a step feature in here so if

you're repairing something or

prototyping you might need a custom

shaped part like this and normally

they're pretty difficult to produce

industrially parts like this would be

made by injection molding or even

casting but if you only need one part it

may not be you know economically

feasible to do that so the next best

thing would be to machine the part but

the problem with that of course is if

you try to machine a piece of rubber as

you can see the cutter just pushes the

material way instead of actually slicing

through the material it just pushes so

the idea with this cryogenic machining

technique is to freeze the rubber so

that instead of behaving like a soft

material like this if you get it cold

enough it will behave more like a piece

of plastic and then we can actually cut

it make a chip just like a hard material

here's the setup I've got an ultra low

temperature freezer on the ground next

to my knowing machine and there's a pump

with a hose that brings the coolant

which is alcohol in this case up to the

cutting area and then another hose that

drains back to the tank in the freezer

the freezer maxes out at just over

negative 100 degrees C however the

coolant temperature is probably more in

the neighborhood of negative 60s a

negative 80 so you don't actually need a

cryogenic freezer to do this you just

need a bucket with dry ice and some

alcohol and you'll get very similar

temperatures I built a small coolant

capture tray that's suspended above my

CNC milling table this is so that I

don't have to chill the entire milling

machine and I used plastic spacers to

try to provide as much thermal

insulation as possible when thinking of

ways of clamping the rubber down to the

aluminum plate I thought it would be

very useful to use water so I could put

a little bit of water between the rubber

and the aluminum plate and then freeze

it and have the ice hold it in place and

in fact there's a commercial product of

course called the ice vise that's made

specifically for freezing things and

holding them on milling machines

the difference is that the ice vise is

basically just a block of metal that

gets cold and the way that I'm going to

try to do this is to flood the entire

cut area with super chilled alcohol so

you know what happens is the alcohol

dissolves the ice and then it carries it

away and there's no more ice holding

down the part and I thought it would be

such a slow process that you could

easily get you know ten minutes worth to

get a cut done but as it turns out no it

only takes like one or two minutes for

the alcohol to wash away enough ice

where the thing doesn't grip anymore

originally I tried to cut a silicone

gasket and this didn't work because the

silicone actually doesn't become firm

enough at these low temperatures

silicone is too good of a performant or

performs too well at low temperatures

and so the rubber was still soft enough

for the machine wouldn't cut it

so I switched over to neoprene and that

actually is perfectly machinable at

these low temperatures I ended up adding

some simple quarter-twenty bolts to hold

the piece down and act as very simple

clamps and this works just fine I also

had a problem with the pump originally I

used a submersible aquarium pump and

just dumped it in the super chilled

alcohol and after a minute or two the

pump stopped working and I even noticed

bits of plastic breaking off and Grande

cracking so that wasn't going to cut it

luckily I had an external pump that is

magnetically driven so the chamber of

this pump is sealed or it's separate

from the motor and driven through a

magnet coupling but then the problem was

this pump wasn't self priming and so I

had to get a funnel out and prime it

anyway once I got the whole coolant

system working it was actually pretty

easy to use this part was cut with the

end mil that was just laying around in

my end mil box so not typically that

sharp this is a brand new end mill and

as you can see the surface finish and

cut quality's quite a bit better I cut

this in climb milling so that the part

that I wanted to save was climb milled

and this part was conventional milled

and as it turns out it looks like the

finish on the conventionally milled

piece is actually even better so there's

probably a lot of room to experiment to

get as good of a surface finish as

possible I use speed and feed parameters

that are typical with cutting

soft plastics so a pretty high chip load

and relatively low rpms to keep the

rubber from becoming soft at the cutting

point I hope you found that interesting

see you next time byeTop Search Keyword : online earning, , make money online, earn money online, online earning, online earning sites, make money online free, online money income, earn money online free, money online, best way to earn money online, online income site, money earning websites, best online earning sites, easiest way to earn money online, earn money payment bkash, online money income site