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blasting smallish tunnels in hard rock

Anyone here know about blasting person-height&width tunnels in hard rock? I have some contacts here (UK), but broadenin...
121 comments posted 2yrs
posted by null
121 comments posted 2yrs posted by null

Fixturing for machining teflon rings

I'd like to machine a few (2 or 3) teflon gasket rings out of quarter inch sheet stock. The ID needs to be roughly 50 m...
24 comments posted 2yrs
posted by bp
24 comments posted 2yrs posted by bp

collet chuck plans

I've decided to make a collet chuck , haven't yet decided whether to go ER32 or ER40 ... anybody got a link to plans ?...
9 comments posted 2yrs
posted by Snag_one
9 comments posted 2yrs posted by Snag_one

Re: Pot Metal...how to solder?

> All- state alloys had a solder that worked on zinc but I don't recall > what the product number is/was. Try a local w...
2 comments posted 2yrs
posted by jamesruthersr
2 comments posted 2yrs posted by jamesruthersr

Padded Platen Part 2

I may still add a "soft" pad to the platen on a sander, but recently I order new bench top belt grinders. a 1x42 and a...
4 comments posted 2yrs
posted by none
4 comments posted 2yrs posted by none

Best taps 2-56 sti & 4-40 sti for G11

What taps work best tapping 4-40 and 2-56 in G11 material. We have 1400 hole of each size to tap. Looks like Harvey Tool...
0 comments posted 2yrs
posted by SC
0 comments posted 2yrs posted by SC

There's stoves , and there's STOVES

And I have one of the latter in front of my shop for repairs . This thing weighs 440 lbs . It's a very nice stove - Har...
1 comments posted 2yrs
posted by Snag_one
1 comments posted 2yrs posted by Snag_one

Lathe Hendey machine 1902

LATHE HENDEY MACHINE CO 1902
0 comments posted 2yrs
posted by Priscila from Mexico
0 comments posted 2yrs posted by Priscila from Mexico

"hobbyist" mine skip load in haulage shaft

Hello all Already got a challenge I'm looking at. Done webpage showing what I am looking at and conjecturing solutions....
51 comments posted 2yrs
posted by null
51 comments posted 2yrs posted by null

Need a little 'lectronics help

I picked up an overlock sewing machine for a VGP , but I suspect the control is dead . I'll keep looking for a wiring d...
5 comments posted 2yrs
posted by Snag_one
5 comments posted 2yrs posted by Snag_one

Tiny Dana air compressor repair

I've got a couple of little Dana 12 volt air compressors used to inflate tires. Photos are at http://nemesis.zefox.com/...
22 comments posted 2yrs
posted by bp
22 comments posted 2yrs posted by bp

Timing pulley terminology

Looking for a bit of instruction on timing pulley terminology. An otherwise-inidentifiable plastic pulley on a small ai...
6 comments posted 2yrs
posted by bp
6 comments posted 2yrs posted by bp

I Collect Pulleys

Whenever I scrap a piece of equipment or appliance with pulleys I save them. I still never have the exact pulley I need...
22 comments posted 2yrs
posted by none
22 comments posted 2yrs posted by none