An interesting T-Bolt fastener for mills

[Kevin54]

No need to watch the complete video if you don't want to, but for the machinist out there that at times have to have a clamping bolt at a certain angle on a mill, skip ahead to 6:24 and look what this guy did with a swivel and a T-Nut. He had to come up with a way to hold the head down. Nice idea, and one to file away for a later date.

 

[A_Pmech]

Hah! I like it!

 

[rsanter]

Awesome
I have wanted to set my mill up to surface some heads and have been thinking about how to best set it up

Bob

 

[383 240z]

Pretty slick. Keith

 

[nine4gmc]

That is a great idea, thanks for sharing Kevin!

 

[bullnerd]

I've seen swivel hold downs but not homemade, pretty slick.

I hope the ways are in real good shape on that machine.

 

[fnieto]

Very cool, thanks for sharing Kevin.

 

[sr71]

thank you… great idea and execution

 

[larry_g]

I look at that swivel tee nut and wonder if it should have a set screw through it to prevent it from sliding in the slot as the angular force is applied to it. The set screw would go through the Tee nut and apply force to the bottom of the Tee slot.

lg
no neat sig line

 

[Mud]

Seen the same thing on a F111.

 

[rdn2blazer]

Cool tooling ideas. Dig the T nut swivel for sure. Only thing I've never liked about a shop resurfacing a head on a Bridgeport is table sag from the weight of the table and component on the table once it gets past 1/2 the table on the "Y" ways. Especially on an old warn BP. I've measured table sag as much as .012 on a really worn mill. No thanks.

IMO a quality shop should not use a BP. But I know many shops DO use BP's to resurface. Unless the head is setup on a granite surface plate, head surface facing down on three precision height points and flatness is varified I would not trust it was a flat surface coming off almost any BP mill. I'd trust a new mill to be good for a thou or two. I've never seen a mill that DIDN'T have table sag when run out to the ends just from the weight of the table, not to mention the part weight.

 

[Strouty]

The part weight was negligible and he only moved the table a little bit. It didn't look like a hack job to me, of course I am a concert pianist, but I did stay at a holiday inn express last night.



Sarcasm intended, noted to clarify my statements.

 

[Kevin54]

Cool tooling ideas. Dig the T nut swivel for sure. Only thing I've never liked about a shop resurfacing a head on a Bridgeport is table sag from the weight of the table and component on the table once it gets past 1/2 the table on the "Y" ways. Especially on an old warn BP. I've measured table sag as much as .012 on a really worn mill. No thanks.

IMO a quality shop should not use a BP. But I know many shops DO use BP's to resurface. Unless the head is setup on a granite surface plate, head surface facing down on three precision height points and flatness is varified I would not trust it was a flat surface coming off almost any BP mill. I'd trust a new mill to be good for a thou or two. I've never seen a mill that DIDN'T have table sag when run out to the ends just from the weight of the table, not to mention the part weight.

Same here. We had a long part that we had to hold within .005 that was 40" long, and had to flycut it on an older Bridgeport. We got it done, but like you said, we had quite a bit of drop in the table. I ended up setting sollers under the end so when the table came out, the rollers would hold it up.

The only way to properly do a head on a mill is to use a bed mill, and not a knee mill