Search found 353 matches

by revrnd
Sun Apr 12, 2015 9:45 pm
Forum: General Discussion
Topic: The home shop machinist, health of the hobby
Replies: 128
Views: 41027

Re: The home shop machinist, health of the hobby

My father was a draftsman & tried to be handy around the house. Sometimes he knew his limits, other times not. He had been around tool & die makers and machinists since the early 50s when he started his apprenticeship. When I then my brother started high school we were steered towards the shop. I to...
by revrnd
Sat Apr 11, 2015 11:20 am
Forum: Lathes
Topic: Indexable Lathe Tooling Question
Replies: 8
Views: 1236

Re: Indexable Lathe Tooling Question

The W insert will let you face and turn both ways with a deeper depth of cut. (face and turn) The T insert would require 2 different holders to do the same thing. One holder for facing and another for turning. Both inserts are nice to have on hand, so watch ebay and look for deals when you start to...
by revrnd
Fri Apr 10, 2015 9:05 pm
Forum: Milling Machines
Topic: Safe use of a slitting saw.
Replies: 35
Views: 7682

Re: Safe use of a slitting saw.

If the fluid you spoke of was for use with aluminum, then, no, that wouldn't be the 1,1,1-trichlor. It was used for ferrous alloys and stainless, but not recommended for aluminum. For that, they had a different formulation, which may well be the same today. If memory serves, a fresh can of the flui...
by revrnd
Fri Apr 10, 2015 6:41 pm
Forum: Milling Machines
Topic: Safe use of a slitting saw.
Replies: 35
Views: 7682

Re: Safe use of a slitting saw.

I tend to use commercial lubricants for tapping. It's all too easy to break a tap, usually on the last hole, so I try to eliminate potential problems.. Tapping, as most of us know, is a demanding operation, so anything that can be done to lower friction is wise. Proper lubricants do just that, whic...
by revrnd
Fri Apr 10, 2015 11:02 am
Forum: Milling Machines
Topic: Safe use of a slitting saw.
Replies: 35
Views: 7682

Re: Safe use of a slitting saw.

What Russ said. Besides, at least for me, it smells much better (to me, at least) than kerosene, which is the recommended fluid for aluminum. I've never tried alcohol, although it may be quite good for machining aluminum. Dunno! I do know the fire hazard would be of concern, though. Besides, that's...
by revrnd
Fri Apr 10, 2015 10:48 am
Forum: General Discussion
Topic: How do they make the aluminum splayed fins?
Replies: 10
Views: 923

Re: How do they make the aluminum splayed fins?

As I understand it, copper is much better at thermal conductivity, something like 50+% better as I (think I) recall. So getting localized heat away from the source it wins hands down. Where they wind up about the same is in material to air transfer, which is completely dominated by surface area aff...
by revrnd
Thu Apr 09, 2015 9:01 pm
Forum: General Discussion
Topic: How do they make the aluminum splayed fins?
Replies: 10
Views: 923

Re: How do they make the aluminum splayed fins?

Aluminum heatsinks are typically made by extrusion of finned structures in long bars (for which there is already amply manufacturing base for similar mechanical components), which are then chopped into individual heatsinks. If needed/desired the fins can be cross-cut for additional thermal transfer...
by revrnd
Thu Apr 09, 2015 6:46 pm
Forum: Milling Machines
Topic: Safe use of a slitting saw.
Replies: 35
Views: 7682

Re: Safe use of a slitting saw.

The machining of my 2 slits went well w/ a 3" saw. I used tapping fluid as a lubricant. "Timidly" I used .030" cuts. For the RPM, I just used the (CS x 4)/D. I just forged ahead and started to slit things, using what I thought was an appropriate SFPM and a feed that sounded OK, with plenty of brushe...
by revrnd
Thu Apr 09, 2015 9:19 am
Forum: Lathes
Topic: Indexable Lathe Tooling Question
Replies: 8
Views: 1236

Re: Indexable Lathe Tooling Question

Looking @ the dimensions of the 2 holders, the like looks the same rake (-5*). The side clearance is just slightly different between the 2, 3* w/ the MTJNR vs 5* w/ the MWLNR.

I'll stick w/ the MTJNR.
by revrnd
Wed Apr 08, 2015 4:33 pm
Forum: Lathes
Topic: Indexable Lathe Tooling Question
Replies: 8
Views: 1236

Indexable Lathe Tooling Question

I have the following turning tools: One is a MWLNR 12-4 that uses WNMG - 43 inserts (from my working days prior to 2008, misplaced during my move) The 2nd is a MTJNR 12-3 that uses TNMG - 32 inserts (purchased after setting up my shop) Is there pros or cons between the 2 setups? Other that the shape...
by revrnd
Wed Apr 08, 2015 9:01 am
Forum: General Discussion
Topic: be careful
Replies: 37
Views: 4371

Re: be careful

Lifting chains go through a testing for cracks at least annually or more often as determined by use, where they are cleaned, degreased, and dipped in a dye, and then spayed with a developer when dry. The light colored developer will leach out a pink or red colorant from the dye showing any cracks i...
by revrnd
Tue Apr 07, 2015 1:17 pm
Forum: General Discussion
Topic: Broken end mill, ruined part!!
Replies: 59
Views: 5405

Re: Broken end mill, ruined part!!

"In your case you bent yours, but that may have been a good thing, as HSS is known to rupture violently, propelling bits great distances with considerable force." My crash involved a 3/4" 4 flute. It went off like a gunshot. I asked the apprentice working @ the next mill if he saw the cutter go fly...