I would guess that the zinc is good for the ways - it's one of the additives that is claimed to be important in motor oils - especially in engines with flat tappet camshafts where there's lots of sliding contact between surfaces.
But I am also of the camp that not-quite-the-right-oil, is better...
It is probably more expensive for the kind of work you are doing, because of the low quantity. I would guess when you need to make a part for a machine you only need one, not 10,000.
Like hvnlymachining said, much cheaper in mass production than for one offs.
Also as previously mentioned...
I have never been myself, but I suppose if I ever get the chance to travel to Switzerland, I would like to visit the history museum in Moutier.
https://www.museedutour.ch/
They have exhibits on the origins of the Swiss type lathes with sliding headstocks. Many of the early pioneers in that...
I have never heard of running diesels with propane. Interesting.
Some folks run their used motor/cooking/other oils in their diesels with the right preparation and setup. But only really worth the cost/time to set up the proper filtration and processing system if you use big amounts, and...
Believe it or not, there's quite a few manufacturers and gunsmiths in Mass. You have to jump through a few hoops to get all the necessary licenses, but it's still possible.
I saw that posting this morning. Also looks like there is a LaPointe broaching machine in the mix as well.
I am unable to save that machine myself but I would hope that somebody does. I wonder if it is capable of doing rifling in gun barrels...
Very true, this happened to me.
Don't mean to toot my own horn, but I was placed in a department where I learned the ins and outs quickly and did a good job. Also had a knack for doing data collection and analysis, navigating the QMS, and got along fairly well with others in the department.
So...
Cool old machine, are there any markings on the part that looks to be a gearbox?
I have seen other machines that utilize old car/truck transmissions to replace the step pulleys in changing speed.
Interesting how they went with a chain drive to the spindle instead of a flat or v-belt. Maybe a...
I have not seen many mechanical failures of the table itself, most of your issues will be with the control - motherboard failures, disk drive, monitor, etc.
I think once we had a machine that had worn rails, but as far as I know that was the only one out of a dozen or so machines, that had a...
I've had fairly good luck with OSG for production work.
For projects around the house or maintenance/tool room type work I like using my old GTD set (for the sizes in that set)
I don't own an electric vehicle and it will probably be a long time before I ever will. Partly because I am stubborn and don't want to change my ways. Partly because I know my dumb a** will forget to plug it in and I won't be able to dump kilowatts in the tank quick enough to get to work on...
Oops... when I was referring to "this size thread", I was talking the #12-28. Please excuse the error in communication.
If it were my indicator set, I would try the 12-28 tap/die to clean things up and make it "good enough" to function. Unless you are intent on restoring to original condition...
Sounds awfully close to being a #12-28.
I am assuming your .224/.222 measurements are the major diameters of the thread.
Edit: Taps and dies for this size thread are relatively inexpensive and available from McMaster
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