Search found 240 matches

by choprboy
Thu Oct 17, 2019 10:26 pm
Forum: General Discussion
Topic: Anyone know where I can find this roller?
Replies: 11
Views: 219

Re: Anyone know where I can find this roller?

Looks like an insert out of a sliding door wheelset (most are v-groove, but some glass/cabinet/shower door are flat like this one). Possibly you took it out of a larger assembly from a local hardware store? I'm found similar, but not that exact one yet.
by choprboy
Mon Oct 14, 2019 6:32 pm
Forum: General Discussion
Topic: Plasma cutter options
Replies: 10
Views: 333

Re: Plasma cutter options

Yeah, IPM is a big thing I was looking at to compare different units (when you can find it listed in the manual). Based on my experience with the Spectrum 300, I've come to the conclusion you really want a minimum of about 15 IPM at a given thickness to consider it a clean cut, preferably closer to ...
by choprboy
Sun Oct 13, 2019 9:02 pm
Forum: General Discussion
Topic: Plasma cutter options
Replies: 10
Views: 333

Plasma cutter options

My old Miller Spectrum 300 has about outgrown its usefulness to me. Suppose to cut 1/4+", but that has always been a stretch. Looking to buy something capable of 1/2" clean cuts for the occasional day or two of heavy use. Thought about getting an oxy/acet torch, would like it for the heating option,...
by choprboy
Sat Oct 12, 2019 12:51 pm
Forum: Lathes
Topic: Screwcutting not picking up in the same place
Replies: 19
Views: 550

Re: Screwcutting not picking up in the same place

How can you stop the lathe and reverse with the lead screw engaged? The carriage will still be "coasting" before stopping making it impossible to thread up to a shoulder. Unless the lathe will stop instantly, it won't work. Well... you can use the disengage-engage method to thread up to a shoulder....
by choprboy
Tue Oct 08, 2019 8:20 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

Well... a bit inconclusive testing today. The new plate machines with HSS just fine. With the insert facemill and the same speeds/feeds: new plate - tan to light purple chips, 300M (4340) - dark brown to dark purple chips, old plate - flaming orange stringy chips (like lathe hard turning videos). I ...
by choprboy
Mon Oct 07, 2019 11:24 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

Yeah.. I was worried about the Mn but I couldn't remember off the top of my head. The square tube reading gave me pause on what I remembered and the carbon reading was very low. Perhaps (hoping) it is not an accurate reading (nothing was cleaned before hand so...). That is disappointing if it was an...
by choprboy
Mon Oct 07, 2019 8:33 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

Well, I picked up another unmarked piece of 1/2" plate from the scrap yard today. They shot their gun at it for me (learned a new acronym today... I think is was a LIBS Laser-Induced Breakdown Spectroscopy instead of XRF). Unfortunately it didn't give an ANSI grade, said the new plate was "0.5CrMo",...
by choprboy
Mon Oct 07, 2019 4:25 am
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

Well.. there is a plate on the transmission side, another on the engine side, and about 4" of 12"dia pipe to be welded in between to form a bellhousing for the clutch. So heat will definitely be an issue.
by choprboy
Sun Oct 06, 2019 11:37 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

... you might try annealing it if you need to work with HSS. Unfortunately, the transmission adapter plates are about 18" across... My little oven will go to 2000F, but is only about 8"x8". AR400 drills & taps well with HSS. AR500 is at the upper end of hardness of what you can drill & tap with HSS...
by choprboy
Sun Oct 06, 2019 8:47 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Re: Steel plate identification

Edit: With a small coupon on the mill, HSS endmills will barely touch it, though carbide would chug thru. My insert facemill threw glowing orange hot chips everywhere. HSS drills immediately crapped out, a cobalt steel drill did the job but wasn't happy. I broke the first and second tooth (the tooth...
by choprboy
Sun Oct 06, 2019 7:55 pm
Forum: General Discussion
Topic: Steel plate identification
Replies: 22
Views: 1229

Steel plate identification

Anybody familiar with common steel plate grades and how hardened/AR responds to machining? I picked up a 2'x6' chunk of 1/2" steel plate from the scrap yard a while back to make plates for a transmission mount. There is usually a large supply of all different pieces, but little of it has original ma...
by choprboy
Tue Sep 24, 2019 3:30 am
Forum: General Discussion
Topic: Will a Bigger Compressor Make me Happy?
Replies: 31
Views: 2789

Re: Will a Bigger Compressor Make me Happy?

... It's a 5-HP Curtis (actually a Fu Sheng). When I got it, it was a dream come true, but it seems like it poops out with buffers and the DA sander. It's rated at 17.3 CFM. The next step up is about 7 CFM more... I wonder what others here are doing with their compressors. Is my experience typical?...