Search found 259 matches

by choprboy
Fri Nov 22, 2019 1:19 pm
Forum: Lathes
Topic: 5C collet chuck
Replies: 10
Views: 4480

Re: 5C collet chuck

I think you want to search for a "plain back 5c chuck". A bunch of different manufacturers make the; Bison, TMX, etc., also the cheaper China versions. There is also a cheap round cylinder 5c chuck (I have one) that can be held in a standard 3/4 jaw chuck. Examples: https://www.kbctools.com/itemdeta...
by choprboy
Sun Nov 10, 2019 6:35 pm
Forum: General Discussion
Topic: Smearing On Cutter Block After Using Evapo-Rust
Replies: 13
Views: 4138

Re: Smearing On Cutter Block After Using Evapo-Rust

Rust removers generally convert "rust", Fe2O3, into other softer/dissolvable (usually black) iron oxides, iron sulfate, and iron phosphates. Those may leave a staining on the surface, but should hopefully should come off with more clean rust remover, a light acid (though that may cause an immediate ...
by choprboy
Tue Oct 29, 2019 1:12 am
Forum: General Discussion
Topic: Flap Wheel Grit for Good Finish?
Replies: 3
Views: 2117

Re: Flap Wheel Grit for Good Finish?

I use them all the time; 36, 60, and 120 grit. Infact, unless I am bulk grinding off large chunks of metal, I use them almost exclusively and find them much easy to control grind depth and finish compared to a hard disc. When brand new they will cut aggressively, but pretty quickly wear off a bit an...
by choprboy
Fri Oct 25, 2019 4:19 pm
Forum: General Discussion
Topic: phosphor bronze or beryllium copper
Replies: 6
Views: 2402

Re: phosphor bronze or beryllium copper

They come up on Ebay and other surplus sites from time to time, but they bring a premium and damaged/unservicable units seem to be a problem (early handheld versions were pretty fragile, stationary units were quite big and the x-ray emitters/detectors worn out by the time they were retired). For the...
by choprboy
Fri Oct 25, 2019 1:40 pm
Forum: General Discussion
Topic: phosphor bronze or beryllium copper
Replies: 6
Views: 2402

Re: phosphor bronze or beryllium copper

X-Ray Fluorescence or X-ray Resonance Fluorescence. It shoots a beam of X-rays at the material and measures the emitted x-rays/light spectrum to determine the elemental composition. There are also versions that use electron beams and laser pulses to accomplish the same thing.
by choprboy
Sat Oct 19, 2019 9:57 pm
Forum: General Discussion
Topic: Splicing Romex?
Replies: 40
Views: 12825

Re: Splicing Romex?

And, where run through joists, the holes must be 2 or more inches away from the edge. This is so any nails driven into the joist won't penetrate the wire. It is a minimum of 1-1/4" from the edge (NEC 300.4A), if closer it is allowed but a nail plate must be used to prevent nails/screws from penetra...
by choprboy
Sat Oct 19, 2019 6:29 pm
Forum: General Discussion
Topic: Rotary shaft seal with concentric tolerance?
Replies: 18
Views: 4469

Re: Rotary shaft seal with concentric tolerance?

Weird. I can't think of a modern seal that would work off hand. Could the housing originally have had a rope seal (possibly with a hard grease ring like John suggested)? That would deform to fit the shaft and take up an offset. ...Edit... Re-reading, maybe I'm misunderstanding, this has 0.7mm of sta...
by choprboy
Thu Oct 17, 2019 10:26 pm
Forum: General Discussion
Topic: Anyone know where I can find this roller?
Replies: 11
Views: 2833

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: 3329

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: 3329

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: 7475

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: 6164

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 ...