Search found 251 matches

by choprboy
Wed Aug 21, 2019 9:56 pm
Forum: General Discussion
Topic: Shop Uses for Scuba Tank?
Replies: 16
Views: 2875

Re: Shop Uses for Scuba Tank?

I have two scuba tanks which are full and in near-mint condition. I do not dive. It's not my thing. I'm not even certified. I only used them when something was wrong with the boat. Is a scuba tank useful for anything around a shop? I don't want to sell them and then find out they were useful. Porta...
by choprboy
Tue Aug 20, 2019 3:56 pm
Forum: Welding
Topic: MIG Stainless to Mild Steel?
Replies: 17
Views: 2852

Re: MIG Stainless to Mild Steel?

... I used .025" L308, because I had it. I am not a great welding guru. I assume the settings for .030" are too hot for .025", right? Anyway, I used a .030" setting from the chart on the welder, and I made the mistake of picking the larger of the two likely looking metal thicknesses. I guess I shou...
by choprboy
Sat Aug 17, 2019 1:24 am
Forum: Welding
Topic: MIG Stainless to Mild Steel?
Replies: 17
Views: 2852

Re: MIG Stainless to Mild Steel?

You want to use straight argon with stainless MIG wire, CO2 or C25 with mild steel MIG wire, DCEP. DCEN for flux cored.
by choprboy
Tue Aug 06, 2019 5:23 pm
Forum: General Discussion
Topic: Gibs & Material
Replies: 10
Views: 2259

Re: Gibs & Material

Cast Iron. Stefan Gotteswinter recently did a video on machining gibs:
https://www.youtube.com/watch?v=BTeoIT-l68s
by choprboy
Mon Jul 08, 2019 7:31 pm
Forum: Lathes
Topic: Home made steady
Replies: 9
Views: 2570

Re: Home made steady

Looks good... Next job, chop the top half off, weld a hinge on the back joint and a bolt/nut on the front joint to reattach it. Now you can remove/swap work without moving the steady rest on the lathe or repositioning the rollers.
by choprboy
Tue Jun 11, 2019 4:01 pm
Forum: General Discussion
Topic: Worn pulleys/ additive metal
Replies: 10
Views: 1929

Re: Worn pulleys/ additive metal

You mean plasma spray/metal spray? Using a plasma or acetylene torch to blow fine metal particles onto the part, which melt in the stream and then adhere to the part surface. Used for buildup of shafts/etc. https://youtu.be/X43SJakLTA8?t=1263 Having had to repeatedly place pulleys that continually g...
by choprboy
Sun Jun 09, 2019 3:14 pm
Forum: General Discussion
Topic: Large motors and soft start
Replies: 30
Views: 4781

Re: Large motors and soft start

Harold, I agree with the others, a star-delta (or wye-delta) starter would seem to fit the bill. The star connection reduces the effective voltage across each motor winding by ~40%, which reduces the starting current by ~66%. Do you know the actual fuse installed in the service? Thermal fuse blow ch...
by choprboy
Sat May 04, 2019 12:08 pm
Forum: General Discussion
Topic: UP Bigboy 4014 first steam and whistle
Replies: 5
Views: 1808

Re: UP Bigboy 4014 first steam and whistle

A longer video with 4014 first trip in the yard and out to CO.
https://www.youtube.com/watch?v=RR7Q27cIEvo
by choprboy
Mon Apr 22, 2019 12:18 am
Forum: General Discussion
Topic: Mounting an INVERTER
Replies: 12
Views: 4125

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: 3920

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: 10
Views: 4561

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: 10
Views: 4561

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...