Search found 1536 matches

by earlgo
Wed Jun 06, 2012 8:59 pm
Forum: Milling Machines
Topic: Criterion boring head shaft removal
Replies: 7
Views: 4442

Re: Criterion boring head shaft removal

Mr Mowbray is most likely correct. The threads on the boring head I have are RH. Might the suggestion be made instead of gripping the R8 with a pipe wrench, drill a hole in the shank flange for a spanner wrench pin. That might work as well but leave less marks.
--earlgo
by earlgo
Sat Jun 02, 2012 7:55 am
Forum: Lathes
Topic: tool post grinder
Replies: 22
Views: 4636

Re: tool post grinder

I have seen lathes with TPGs shrouded with shop rags and looking like a heart transplant operation in order to keep the swarf off the lathe. This will work if cleanup is careful and complete. I am assuming that the TPG will not be used on a regular basis so casual use and careful cleanup will not ca...
by earlgo
Thu May 31, 2012 8:18 pm
Forum: Milling Machines
Topic: Machining 50 grooves around part
Replies: 15
Views: 2361

Re: Machining 50 grooves around part

ctwo wrote: How would you do it with a fixed-angled head mill? Clamp the part in a vise and use a checkering file for spacing and a three square file and get on with it. Oh, wait, this is a milling machine forum, sorry I lost my head... :twisted: --earlgo You might also use a fly cutter if you don't...
by earlgo
Sun May 27, 2012 3:35 pm
Forum: Milling Machines
Topic: Proper grind for a fly cutter?
Replies: 6
Views: 12150

Re: Proper grind for a fly cutter?

A bit ago the discussion turned to this fly cutter issue, and at that time I didn't want to muddle the subject. Since no-one has posted in this one for a while, I thought now is the time. These are the typical fly cutters one can buy in these and larger sizes from various makers. http://i1105.photob...
by earlgo
Sat May 19, 2012 8:56 am
Forum: Lathes
Topic: Is it worth much
Replies: 17
Views: 2791

Re: Is it worth much

Sometimes the gears are available on e-bay. For new ones, Boston Gear lists change gears. The Atlas gears are Zamak as mentioned and take an internal bushing with 2 diametrically opposed keys. I'd not worry that the gear teeth are worn as they will still work. When loaded, they still run OK and prov...
by earlgo
Thu May 10, 2012 8:36 pm
Forum: Milling Machines
Topic: Centex Mill rebuild
Replies: 55
Views: 12642

Re: Centex Mill rebuild

I couldn't help but notice the resemblence between your Centex mill and the Delta/Rockwell drill press that I have been keeping since the middle '60's. Of course the column and table are vastly different, but the drive is similar enough to recognize the origins. The countershaft and inverted motor a...
by earlgo
Tue May 08, 2012 8:30 pm
Forum: Lathes
Topic: Newbie - still.... and need to make a part
Replies: 31
Views: 5625

Re: Newbie - still.... and need to make a part

WD-40 on the file will help prevent sticking the aluminum in the teeth, just as it helps when turning. As mentioned, the file card is your best friend on this job. There are special files for lathe filing. The teeth are at a much greater angle than those on a mill bastard. This helps to shear off th...
by earlgo
Tue May 08, 2012 8:17 pm
Forum: Milling Machines
Topic: A cumbersome accessory for a horizontal mill
Replies: 16
Views: 3427

Re: A cumbersome accessory for a horizontal mill

Sorry this is late but SOME of us have to work to pay SS so the rest of you guys can post... :P Here is the side view of the adapter showing the #40NMTB and the outboard boss. I have 2 outboard supports, 1 for this adapter and 1 with a bushing and/or center for the milling arbors. http://i1105.photo...
by earlgo
Sun May 06, 2012 4:38 pm
Forum: Milling Machines
Topic: A cumbersome accessory for a horizontal mill
Replies: 16
Views: 3427

Re: A cumbersome accessory for a horizontal mill

Your eyes are not deceiving you, the buttress threads are indeed sloping the "other" way. My guess is that when the nut is tightened, the sloped threads allow the collet to grip the tool. Odd arrangement to say the least. There is a shank to fit the #40NMTB spindle and the shank has a gear attached ...
by earlgo
Sun May 06, 2012 8:17 am
Forum: Milling Machines
Topic: A cumbersome accessory for a horizontal mill
Replies: 16
Views: 3427

Re: A cumbersome accessory for a horizontal mill

To which bushing are you referring? This machine was inherited from my dad who bought it from a local college. The machine was in the college physics "laboratory" when I was there in the early '60s, and had a GE DC motor in it and the controller/rheostat was in another room, as it was mounted on a 3...
by earlgo
Sat May 05, 2012 8:35 pm
Forum: Milling Machines
Topic: A cumbersome accessory for a horizontal mill
Replies: 16
Views: 3427

Re: A cumbersome accessory for a horizontal mill

There is no marking on the head that I have found except for a serial number on the boss that is gripped by the outboard support. The chuck is part of the spindle that is similar to the one with the buttress threads. The spindle has sleeve bearings and is held in place by a nut threaded on the upper...
by earlgo
Sat May 05, 2012 5:23 pm
Forum: Milling Machines
Topic: A cumbersome accessory for a horizontal mill
Replies: 16
Views: 3427

A cumbersome accessory for a horizontal mill

Instead of sitting back and sniping, I thought I'd share pictures of an accessory that came with the mill I am caretaking. As can be seen it is used to convert the horizontal mill to a vertical mill. The head is a 2:1 ratio over the spindle rpms, and it is reversable with a shot pin lever. Unfortuna...