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When you have a face mill that takes obsolete inserts, particularly those made by only one vendor, it is time to replace the face mill.

What are you asking for them?

It is unwise and potentially dangerous to make recommendations for strength, deflection, or material specs without knowing the ANSI/ASTM requirements for playground equipment. Check here first.
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Interested in the indexer that fits into a lathe spindle. If the other guy doesn't take it I am interested in the Heinrich cross hole jig.

I turned a number of ER collet chuck shanks. It can be done quite easily with carbide tooling. I got the final size and finish with a toolpost grinder.

The tubing is probably in a work hardened condition. Annealing would make it more workable. As Dumpster said that small a radius may not be possible. I doubt that annealing and using a bender with...

The first item is a tooth rest for a toll & cutter grinder. The last item-is an indexing drive plate for cutting multiple start threads. I have only seen them in photos, never a real one. Probably...

You definitely want to turn that part around in the chuck for a more secure grip. A .375 lead will mean substantial cutting forces. You will probably need a special threading bar for that pitch &...

A 1/2" tap with a 1/2"lead, I can't imagine it would work very well without a lot of axial force, almost half way between tapping and broaching.

They look similar to Dumore spindle adaptors for a toolpost grinder.

https://www.sdp-si.com/eStore/..%5Css%5CPDF%5C79004023.PDF

Green Bay Manufacturing

Your setup is entirely adequate for tramming the mill. I keep my indicator point above the table and slip a parallel under the point to gt my reading. If the indicator point touches the table there...

The manufacturers of these alloys often have guidelines for machining their product.

Viking and Norseman made in Minnesota

A DPDT toggle or slide switch to reverse the polarity of the brushes will do it. The problem is there is not sufficient space within the drill housing for it.

Greenfield did sell a tap and die set in machine screw sizes and maybe to 1/4" with 5/8 dies. My father had a set. Nice die stock came with the set. As I recall it had jaws for centering on the...

Norseman or Viking.

They are piloted kingpin reamers. Probably better to sell to the truck and automotive community.

Just get the appropriate apps for your phone.

Last time I was in Riverview Surplus in Moline IL they had one on the floor. It looked rough from storage in an unheated building. The motor shaft turned and the spindle turned (by hand). The...

Veggie oil also oxidizes to a sticky varnish and is damned difficult to remove.

I am appalled at the number students that come here at the beginning of their project. They should be doing their own research first. At the prelim stage I think our only duty is to tell them where...

https://www.freemansupply.com/tables/renshapemachining.htm

Check Amazon.

There is not nearly enough information given to allow even a wild assed guess of the loads. Find a structural engineer with experience in small bridges and furnish him ALL the relevant information.