Search found 207 matches

by choprboy
Mon Apr 22, 2019 12:18 am
Forum: General Discussion
Topic: Mounting an INVERTER
Replies: 1
Views: 77

Re: Mounting an INVERTER

Can an inverter be mounted directly to a motor? On something like a Rockwell vertical mill, where you might have a drum switch mounted directly to the motor junction box. Could an inverter be mounted on the same position? On the motor.. no, there isn't much structure to mount to. On the machine bod...
by choprboy
Fri Apr 12, 2019 3:12 pm
Forum: General Discussion
Topic: Small Diameter Slitting Saw
Replies: 13
Views: 570

Re: Small Diameter Slitting Saw

MSC has some 3/4"x0.040", but they are pricy. McMaster has some 3/4"x3/64" (0.047") as well. Micromark has some for Dremels/ertc that are 3/4"x0.15". I would have thought LittleMachineShop would have some, but they only seems to have a handful of larger sizes now... 1/2"D is pretty small. I may have...
by choprboy
Thu Apr 04, 2019 11:00 pm
Forum: Milling Machines
Topic: Rockwell Vertical Mill 21-100
Replies: 8
Views: 516

Re: Rockwell Vertical Mill 21-100

Yes... After a few years of using mine, I find one of the biggest drawbacks to the 21-100 is the lack of a lower speed range. I find I never go more than 2400 rpm, but even the lowest 370 rpm is frightful when trying to do a large fly cut or bore a 4" hole.
by choprboy
Thu Apr 04, 2019 10:54 pm
Forum: Milling Machines
Topic: Rockwell Vertical Mill 21-100
Replies: 8
Views: 516

Re: Rockwell Vertical Mill 21-100

I don't know if they are taller, but yes apparently there are two versions, one with a flanged column and one with a flared column. I *think* the flanged where the earliest, production ran thru a couple versions of the Delta/Rockwell company from the late 50's to early 80s, but I don't really know m...
by choprboy
Wed Apr 03, 2019 9:44 pm
Forum: Milling Machines
Topic: Rockwell Vertical Mill 21-100
Replies: 8
Views: 516

Re: Rockwell Vertical Mill 21-100

Are you sure it is not DO-6372 (Dee-Ohh)? Delta/Rockwell serial number format apparently varied by manufacturing plant. a DO prefix would seem to indicate a 1967 Tupelo. Do you have the original motor on the mill? It may give you some additional information. See: http://wiki.vintagemachinery.org/Del...
by choprboy
Sat Mar 09, 2019 4:56 pm
Forum: General Discussion
Topic: Spinning bearings with air
Replies: 11
Views: 818

Re: Spinning bearings with air

The street wisdom is "never spin bearing with compressed air" Why? I would guess that the reason is that you are blowing contamination into, and oil/grease out of, the bearing race, thereby shorting the life of a new bearing about to be installed. But yeah, cleaning an old gritty bearing I don't th...
by choprboy
Sun Mar 03, 2019 4:27 pm
Forum: Welding
Topic: welding unistrut
Replies: 4
Views: 618

Re: welding unistrut

I've welded a bunch of unistrut for various frames (microwave radio/tower/building brackets/cable trays/etc.). The zinc and yellow can be welded directly, but even with grinding it is not a pretty weld (unless you grind way back), do to zinc contamination. The yellow is zinc-chromate, so its pretty ...
by choprboy
Thu Feb 21, 2019 10:43 pm
Forum: General Discussion
Topic: Mysterious "1/2 Axis" Displayed on DRO
Replies: 13
Views: 2147

Re: Mysterious "1/2 Axis" Displayed on DRO

Well... the above link is dead as the site changed its layout... but if you had gone to the site and click Support->Manuals->Accessories you would find it:
http://www.atrump.com/support/92-suppor ... nload.html

Or... search "Griffin GF800 dro" on Google and it is now the first link.
by choprboy
Mon Jan 21, 2019 10:42 pm
Forum: Milling Machines
Topic: What is this CAT40 tool?
Replies: 13
Views: 1820

Re: What is this CAT40 tool?

Basing on what I have plans to make out of a morse taper stub... someone's custom spade drill bit holder? The screws being the alignment pins and the large hole for a set screw to lock it in place?
by choprboy
Mon Dec 24, 2018 8:14 pm
Forum: General Discussion
Topic: What are these kind of taps called?
Replies: 11
Views: 1144

Re: What are these kind of taps called?

Well... the are 3 basic tap thread taper/chamfer: Taper, Plug, and Bottoming. The more taper the easier it is to cut (less cutting force on each tooth), but the longer it takes and less efficient the cut.The tap in your description is a bottoming tap. The number threads in the taper varies a bit man...
by choprboy
Mon Dec 10, 2018 10:49 pm
Forum: Home Shop CNC
Topic: How easy to add USB to a 1993 hass lathe?
Replies: 8
Views: 1216

Re: How easy to add USB to a 1993 hass lathe?

I don't have a Haas, but at one point I had done some research when I was thinking about getting an old one to play around with (still don't have the time or space...). Apparently it is pretty easy to convert one, as long as the Haas had the floppy drive option installed. You just replace the floppy...
by choprboy
Sun Dec 09, 2018 8:27 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 3877

Re: Diagnosing a Milling Machine problem

... I also notice that this cutter in this particular collet seems to be out of round. In other words, when I spin the tool in the collet (not in the machine) I feel alternating tightness and looseness between the two. This different than all the other collets and cutters. Maybe one is out of round...