How to f**k up a bridgeport

[aboard_epsilon]

This guy has no idea

enjoy

http://uk.youtube.com/watch?v=wMaq2QaYUEE

http://uk.youtube.com/watch?v=geTJsmNhtkE

All the best.markj

[torker]

Oh...must be time to start a new mill/drill thread I do that...

[Carld]

both video's failed to finish. They were so dark I couldn't tell what he was really doing. In the first it looks like he is using a multi insert head and we ran them at 1000 to 2000 rpm with a .050" to .100" DOC all the time so what is unusual about what he is doing?

In the second video it looks like he is making a cut with a flycutter and says it's .100" DOC. I normally run my flycutter at 1000 to 1500 rpm with a DOC of .050" with no problem.

When I worked for a hydralic shrinker/expander co. they used flycutters exclusively and we always ran them as I described. The cutter has to be carbide with a leading edge angle of about 45 deg and it will cut steel like butter.

[aboard_epsilon]

in the first video ......he's cutting with blunt inserts ...you can hear the motor straining, he even turns the sound down to disguise it, its straining its balls off, all he's doing is burnishing ..no cutting taking place ....using it like an angle grinder.....way too fast as well.

in the second again you can hear the motor straining .......i posted the wrong one there ...there is another vid where he cuts less and you can really hear the motor ..about to burn out ..if he was to do that for a few more Min's it would burn out.

for a another giggle have a look at his lathe vids...

i think he's just taking the piss .and is trying to destroy that bridgeport ...some other vids he's made are ok.

[oldtiffie]

Nope.

I think that is may well be Kosher.

If the chips are blue or hotter you will or may not see them glowing in the lighting used on a mill most times, but it is quite possible that you will see the occasional "glow-worm" in the dark - just as it the posts here show it. Perhaps if he pushed harder you might see them in normal lighting.

That being the case it may well be a good example of a BP trying to emulate an average Chinese mill-drill (possibly "round-column") again.

And failing.

Again.

Now if he were using "Chinese" cutters instead of "made in USA" cutters he just might do better on a BP.

[torker]

I had to narrow the small ends on some connecting rods for a guy here awile back,
Them things really suprized me how hard they were. The "spark show" off them was pretty spectacular.

[gnm109]

Oh...must be time to start a new mill/drill thread I do that...

I'd like that. Maybe one about round-column machines....heh heh. That should get some nice comments.

[lazlo]

in the first video ......he's cutting with blunt inserts ...you can hear the motor straining, he even turns the sound down to disguise it, its straining its balls off, all he's doing is burnishing ..no cutting taking place

in the second again you can hear the motor straining.

Yeah, he doesn't know what he's doing. In the first video he's running about a 3", 5- or 6-tooth cutter at what looks like 1200-1500 RPM. That's around 1,000 - 1,200 SFPM (!)
You can't see what DOC he's taking, but like Mark says, the machine is straining so badly once it gets in the cut that he turns down the volume

I'm guessing this is an American tool dealer: "Lee Machine" -- the other videos look like he's trying to sell the machines.
The comments on the second video (with the flycutter taking a .1 DOC at 1,000 RPM or so), are pretty funny:

".100?? WTF! Dude you have no clue what you are doing do you? That depth of cut is so wrong! and the feed was too fast. You are going to trash the quil bearings and god knows what. Sell your sh!t before you f*ck it all up, if you have not already doing dumb sh!t like this."

[Carld]

lazlo, with a 45 deg angle on the leading edge of the cutter .100" DOC @ 1000 or more on steel works fine. At one company I worked for we did it all the time at .050" and a few times at .100" DOC. They had been doing it that way for years and when I left there three years later the mills still had good bearings. We ran the multi insert heads at about the same rpm but faster feed and the chips came off red or white at times.

We used brazed carbide in the flycutters and they had to be sharp. If they dulled at all they began to hammer. The inserts have to be sharp as well and any sign of loading the motor, hammering or mostly white chips is a sign to rotate the inserts.

As stated by others, he is not using sharp cutters and maybe not even using a BridgePort. The videos are to poor to tell for sure.

[derekm]

lazlo, with a 45 deg angle on the leading edge of the cutter .100" DOC @ 1000 or more on steel works fine. At one company I worked for we did it all the time at .050" and a few times at .100" DOC. They had been doing it that way for years and when I left there three years later the mills still had good bearings. We ran the multi insert heads at about the same rpm but faster feed and the chips came off red or white at times.

We used brazed carbide in the flycutters and they had to be sharp. If they dulled at all they began to hammer. The inserts have to be sharp as well and any sign of loading the motor, hammering or mostly white chips is a sign to rotate the inserts.

As stated by others, he is not using sharp cutters and maybe not even using a BridgePort. The videos are to poor to tell for sure.

a 1000 rpm on a 100mm cutter is at the upper limit but is not really above it...
you can get 1100 sfm for steel inserts