Search found 205 matches

by johnfreese
Wed Aug 09, 2017 12:17 pm
Forum: Milling Machines
Topic: R8 shank with ER32 collet system.
Replies: 33
Views: 28196

Re: R8 shank with ER32 collet system.

I use an ER32 collet chuck all the time. As far as tightening, I use a hook spanner with a piece of 1/2" conduit slipped over the handle as a cheater. Usually the spindle brake on me BP is adequate to hold against tightening torque. If I really need to lean on it, I hold the chuck body with a 3...
by johnfreese
Wed Aug 09, 2017 12:12 pm
Forum: General Discussion
Topic: Matching a Taper?
Replies: 20
Views: 11162

Re: Matching a Taper?

Just a hunch: 1 1/2" per foot is a common taper on automotive and industrial equipment. If that is your taper, reamers are readily available. Actually, I could loan you one. It is an old Craftsman repairman's reamer I have had for 40+ years.
by johnfreese
Sun Aug 06, 2017 3:47 pm
Forum: General Discussion
Topic: Boring head
Replies: 24
Views: 7219

Re: Boring head

You can use a square tool bit through the cross hole. Depending on the size of the bit you may need to chamfer the corners for it to fit the hole. Alternatively, you may want to start with a piece of 1/2" round with a piece of carbide brazed to the end.
by johnfreese
Mon Jul 31, 2017 8:17 pm
Forum: General Discussion
Topic: Heat treat oven
Replies: 31
Views: 11678

Re: Heat treat oven

Until you have verified the temperature controller works do not trust it. I had a bad experience with a borrowed furnace. I was annealing a piece of cast iron. I set the controller for the desired temp. I found out the controller did not work. Melted my cast iron part into the floor of the furnace. ...
by johnfreese
Mon Jul 31, 2017 7:57 pm
Forum: General Discussion
Topic: What to do with surface grinder?
Replies: 34
Views: 13046

Re: What to do with surface grinder?

With a workhead that accepts collets you can sharpen end mills, drills, countersinks.
by johnfreese
Mon Jul 31, 2017 6:41 pm
Forum: General Discussion
Topic: Boring a hole
Replies: 10
Views: 3425

Re: Boring a hole

Center the work on the RT. Bore the hole first. Then do the curves on the OD.
by johnfreese
Wed Jul 19, 2017 10:24 pm
Forum: General Discussion
Topic: Saving the hole.
Replies: 14
Views: 6998

Re: Saving the hole.

Check out annular cutters like Rotabroach.
by johnfreese
Mon Jul 10, 2017 3:53 pm
Forum: Milling Machines
Topic: Accuracy of Indexed End Mill Diameters?
Replies: 6
Views: 5822

Re: Accuracy of Indexed End Mill Diameters?

The third character in the insert designation specifies the tolerance on the insert size. Cutter diameter can vary due to insert tolerance.
by johnfreese
Tue Jun 13, 2017 6:35 pm
Forum: General Discussion
Topic: Setting Out Bench Dog Holes & Distance Between Etc
Replies: 25
Views: 8711

Re: Setting Out Bench Dog Holes & Distance Between Etc

Bench dog holes don't need to be spaced very accurately. Tape measure and pencil is good enough. As mentioned the spacing has to be less than the max opening of the vise.
by johnfreese
Thu Jun 01, 2017 3:28 pm
Forum: General Discussion
Topic: Chain Hoist and Chains
Replies: 12
Views: 5431

Re: Chain Hoist and Chains

I think that only grade 80 chain is rated for lifting.
by johnfreese
Mon May 29, 2017 12:06 am
Forum: Lathes
Topic: Threading to a shoulder
Replies: 26
Views: 13857

Re: Threading to a shoulder

Those of us who have lathes with threaded spindles would be foolish to try this.
by johnfreese
Mon May 29, 2017 12:01 am
Forum: General Discussion
Topic: Minimum recommended SFM for carbide inserts
Replies: 6
Views: 5183

Re: Minimum recommended SFM for carbide inserts

There will be a minimum speed needed to obtain a good finish, especially with negative rake inserts. You will probably need to experiment a bit.