Search found 164 matches

by choprboy
Wed Nov 08, 2017 11:20 pm
Forum: Milling Machines
Topic: Rockwell 21-100 Spindle Lubrication
Replies: 2
Views: 113

Re: Rockwell 21-100 Spindle Lubrication

You can't really, not without removing the spindle. You can drop the spindle down and squirt in side oiling port, which will coat the top of the spindle body, but the top bearing usually has a seal. The bearings are supposedly suppose to be oil bath, but there really isn't anything to retain it. Kin...
by choprboy
Sun Nov 05, 2017 10:50 pm
Forum: General Discussion
Topic: Measuring (probable) Acme TPI
Replies: 15
Views: 438

Re: Measuring (probable) Acme TPI

Looks like 8tpi to me. 3/4-6 seems to be "standard", but McMaster and others carry 3/4-8 Acme rod and nuts.
by choprboy
Sun Oct 22, 2017 7:27 pm
Forum: General Discussion
Topic: individual drill bit
Replies: 12
Views: 564

Re: individual drill bit

Not American made and "high quality" is debatable (though definitely better than the black oxide/HSS ones), but HF has single size TiN drill bits in 7-packs. I pick them up in 1/8", 3/16", and 1/4" for quick work and piloting for larger/expensive drill bits. Cuts just fine a...
by choprboy
Thu Oct 19, 2017 8:01 pm
Forum: General Discussion
Topic: A question on sales here ?
Replies: 3
Views: 275

Re: A question on sales here ?

I would say one group an assortment of size, and a second group all the same size. When your trying new things an assortment of different sizes is great. But I find once you have done a bit, having a group of all the same endmill size is far more handy. Other than special things, I now do almost all...
by choprboy
Thu Oct 19, 2017 4:37 pm
Forum: General Discussion
Topic: Compressor woes
Replies: 31
Views: 922

Re: Compressor woes

I would guess reed valve, and may very well be the output reed. Most modern and larger compressors have a separate check valve at the tank, so the pressure behind the pump can be released when the motor stops (easier starting). Edit: Is it the top mounted, belt driven, 3HP or 5HP HF compressor pump?...
by choprboy
Sat Oct 14, 2017 11:22 pm
Forum: Milling Machines
Topic: Bought a Rockwell 21-120 Mill
Replies: 20
Views: 976

Re: Bought a Rockwell 21-120 Mill

Crank the saddle all the way to the front stop, which drags both cover plates to the front. Reverse and crank the saddle to the rear, dragging the top cover plate, and stop when the second cover plate starts to move (about half way back). Push the top cover plate to the rear (under the saddle) with ...
by choprboy
Thu Oct 12, 2017 1:31 am
Forum: General Discussion
Topic: Machining 300M and actually breaking chips?
Replies: 8
Views: 532

Re: Machining 300M and actually breaking chips?

Yeah, I'm on a 3HP 1300lb 13x40 lathe... so I just don't have the power. Tried a few more things. Running geared down, slow and deep, doesn't work, poor cutting action and sticking in the material. Tried a HSS with a sharp edge an deep groove, still won't break and can't turn fast enough to get a de...
by choprboy
Wed Oct 04, 2017 8:32 pm
Forum: General Discussion
Topic: Machining 300M and actually breaking chips?
Replies: 8
Views: 532

Re: Machining 300M and actually breaking chips?

Yeah, just seems like it needs to be more aggressive, but don't have the power. I'm running about 475rpm between about 1-1/2" and 2", step down to 300rpm above 2+". Double checked, .035-.040 doc with a 0.0102 feed rate. Thinking about trying a 431 insert, or maybe getting one of those...
by choprboy
Tue Oct 03, 2017 9:37 pm
Forum: General Discussion
Topic: Machining 300M and actually breaking chips?
Replies: 8
Views: 532

Machining 300M and actually breaking chips?

Anybody have any tips for machining 300M (4340 vacuum arc remelt)? I picked up a bunch of bars of surplus, have had no problems running 4140, but the 4340 is giving me continuous long hot chips that birdnest badly. Comes off real hot, turns purple, sharp and nasty. Playing with all different feeds a...
by choprboy
Tue Oct 03, 2017 9:18 pm
Forum: Milling Machines
Topic: Bought a Rockwell 21-120 Mill
Replies: 20
Views: 976

Re: Bought a Rockwell 21-120 Mill

Interesting, the worm gear tilt is on the back side of the over arm support and faces to the right on the vertical mill. The tightening bolts are also on the right hand side. Must be a difference between the vertical/horizontal column castings.
by choprboy
Tue Oct 03, 2017 1:43 am
Forum: Lathes
Topic: Lathe DRO recommendation
Replies: 14
Views: 721

Re: Lathe DRO recommendation

I have a replacement Sino DRO head on my lathe, I think the original scales are glass. Picked it up from SRA Measurement, good prices, fast shipping, packaged deals or individual parts for different setups.
by choprboy
Tue Oct 03, 2017 1:32 am
Forum: Milling Machines
Topic: Bought a Rockwell 21-120 Mill
Replies: 20
Views: 976

Re: Bought a Rockwell 21-120 Mill

As others have noted, it looks like someone has combined two machines into one (guessing via the mismatched paint and the lack of worm gear for turning the head orientation). Looks like it has the 3phase motor option and someone has put a VFD on it? The belt cover plates show they were using the VFD...

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