Search found 147 matches

by TRX
Sat Oct 06, 2018 6:33 pm
Forum: Milling Machines
Topic: Morse taper end mills
Replies: 7
Views: 3067

I can't see how a standard Morse taper with tang could work without some sort of retaining mechanism. That's current thinking. Elsehwere in the book I found more pictures of tanged Morse end mills in conjunction with Brown & Sharpe horizontal mills. Which is doubly odd, since they also show "tang d...
by TRX
Fri Oct 05, 2018 11:22 pm
Forum: General Discussion
Topic: metric drill set explained?
Replies: 65
Views: 12457

This discussion seems to have drifted from metric drill sets to metric vs imperial fasteners. Internet threads tend to do that... "Hey Rocky, watch me pull a rabbit out of my ha - " [rrAARRR] Metric threads are an abomination. Apparently as long as they're dimensioned in metric units, they're "stan...
by TRX
Fri Oct 05, 2018 10:57 pm
Forum: Lathes
Topic: lapping internal taper?
Replies: 20
Views: 6746

It worked, but it was very slow. It also risked introducing runout. I'd think you'd have to work pretty hard to get any detectable runout. My concern would be introducing low (high?) spots that would reduce the grip on the tool. On the other hand, if your socket is buggered and the proper MT taper ...
by TRX
Fri Oct 05, 2018 10:49 pm
Forum: Milling Machines
Topic: Morse taper end mills
Replies: 7
Views: 3067

Morse taper end mills

So, I'm flipping through my 1940s "Audel's Machinist and Tool Maker's Handy Book", and starting on page 702 there are some pictures and discussion of... tang drive Morse taper end mills. There's a picture of a two-flute end mill marked "P&W". There was a picture of a tang drive Morse taper T-slot cu...
by TRX
Fri Oct 05, 2018 7:55 am
Forum: Lathes
Topic: lapping internal taper?
Replies: 20
Views: 6746

I was looking at the lapping section in my 1940s Audel's machinists manual and found a comment that taper laps were sometimes made, but they recommended against their use. They didn't say why, though. I also found a comment from someone who had a tailstock with a badly damaged socket. He cut the tan...
by TRX
Sun Sep 30, 2018 1:19 pm
Forum: General Discussion
Topic: metric drill set explained?
Replies: 65
Views: 12457

Re: metric drill set explained?

So that'd be 60 drills for the 1-6mm set and 40 for the other one? I'll look for Dormer, then.

I'll see if anything turns up for "100 piece set." What I keep getting from web searches are 13pc 1 to 13mm sets with 1mm steps and some 20pc sets with a few random x.5mm sizes tossed in.
by TRX
Sun Sep 30, 2018 12:27 pm
Forum: General Discussion
Topic: metric drill set explained?
Replies: 65
Views: 12457

metric drill set explained?

So now that I'm using metric drills more often now I thought I'd look into a metric drill set. Perhaps I'm missing something obvious... In a complete "Imperial" drill set there are fractional, number, and letter drills. These are actually three separate standards, lumped together because enough of t...
by TRX
Fri Sep 28, 2018 7:01 am
Forum: Lathes
Topic: lapping internal taper?
Replies: 20
Views: 6746

Re: lapping internal taper?

Well, does the finish of the internal taper even matter, as long as the collet isn't grunchy when you pull it in?
by TRX
Fri Sep 28, 2018 7:00 am
Forum: Milling Machines
Topic: tooling plate
Replies: 8
Views: 3408

tooling plate

Having seen tooling plates in pictures and marveling at how convenient they appeared to be, I decided I should have one too. Looking at the situation further... what do you do about chips?! I haven't seen any pictures of plates with plugs in the unused holes. And if you raised the plate up on stando...
by TRX
Fri Sep 28, 2018 6:53 am
Forum: General Discussion
Topic: Twist drill prices
Replies: 33
Views: 7628

Re: Twist drill prices

Ancient Rome once taxed sunlight! [see: "A Golden Thread : 2500 Years of Solar Architecture and Technology" by Ken Butti and John Perlin, 1980] Americans *do* have a dislike for taxes. It was one of the official reasons we aren't part of Britain any more. And when the New Bosses turned out to be gre...
by TRX
Thu Sep 27, 2018 2:47 pm
Forum: Lathes
Topic: lapping internal taper?
Replies: 20
Views: 6746

Re: lapping internal taper?

Well, how important is the ground finish, then? How about honing? Could I just make a few strokes with a ball hone and call it good? Or will any finish do as long as it's not too rough?
by TRX
Thu Sep 27, 2018 8:09 am
Forum: Lathes
Topic: lapping internal taper?
Replies: 20
Views: 6746

lapping internal taper?

I need to make an internal taper to take a collet. According to my reference books, this type of thing should be hardened, then ground to final size on OD and ID. I don't have a toolpost grinder. I could fake it pretty good on the OD with some flat stock and sandpaper, but the inside has me stalled....