2015 POTD Thread Archive

I had some free time over the last two days and decided to putz around and see if I could muster up a cutts type compensator for a Thompson SMG. After a large amount of chips were removed from a CR 2" piece of stock, here is what I ended up with. I thought it went well. Only problem is I do not at this point have a Thompson SMG or a semi-auto version to put it on. lol

Anyhow, I submit these pics for you to critique - but please be nice.

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I had my first occasion to turn a fairly long (12") part on my new PM1228 yesterday. I didn't measure the taper, but I noticed that it was several thou off, leaving the part wider on the chuck end.

I checked the ways with my level, but couldn't see much twist, if any. I'll have to get some guaging blocks to accurately check for level, as the peaks of the ways are not on the same plane.

I gave the tail stock a tweak away from me and the problem was solved on the first try. The part miked less than a thou variance from begining to the end of the cut, producing a very long hair thin string of swarf on the last pass.
 
Brass magnet, why do yo need a foresight on a Thompson ? Isn't it just a case of you having to stand 26 feet from your enemy and give them a hosing down ? :grin:
 
Franko said:
I had my first occasion to turn a fairly long (12") part on my new PM1228 yesterday. I didn't measure the taper, but I noticed that it was several thou off, leaving the part wider on the chuck end.

I checked the ways with my level, but couldn't see much twist, if any. I'll have to get some guaging blocks to accurately check for level, as the peaks of the ways are not on the same plane.

I gave the tail stock a tweak away from me and the problem was solved on the first try. The part miked less than a thou variance from begining to the end of the cut, producing a very long hair thin string of swarf on the last pass.
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Franko for a very quick and extremely accurate way of checking & /or setting up the tailstock to the head stock centre line , have you seen the You Tube video clip by Tubalcain . Where he turns two tapered mandrels to the same parallel size on the free ends & faces them square across without taking off much the sharp edge . ( I used my small Arkansas stone for it )

Once you slip the taper in the tailstock and one in the head stock taper it's just a case of advancing the face of the tail stock taper to the face of the head stock taper with about four inches of ram showing lock it off and run your finger tips across the joint area to see if either part is projection out of true .
You them move the tail stock back or forwards with the adjusters to remove any misalignment .

I was really pleased to find it so quick and easy , it's worked very well for me . I got a cheap Cinese set off eBay but they do the job extremely well

I now have the two precision tapers wrapped in a soft lightly oiled cloth and am storing them in a labeled up screw top glass jar .

Having diabetes I am well pleased that I can still detect less than half a thou of and inch misalignment with my finger tips.
 
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Bill C. said:
Is it spring loaded? I bought a small one years ago and used it and T handles for all small tapping jobs. They are great tools to have.
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Yes sir, it is spring loaded. The rear cap is delrin turned to a .006" press fit to hold things together.
 
Round in circles said:
Brass magnet, why do yo need a foresight on a Thompson ? Isn't it just a case of you having to stand 26 feet from your enemy and give them a hosing down ? :grin:
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Apparently those darn guns had select fire switches, so semi auto would necessitate the front sight...........I suppose.o_O
 
Round in circles said:
Franko for a very quick and extremely accurate way of checking & /or setting up the tailstock to the head stock centre line , have you seen the You Tube video clip by Tubalcain . Where he turns two tapered mandrels to the same parallel size on the free ends & faces them square across without taking off much the sharp edge . ( I used my small Arkansas stone for it ) ...
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I haven't seen that one, David. I'll have to look at it. I just lucked out with my adjustment and got it right on the first turn. It was way off.
 
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Mark in Indiana said:
Built a Port-A-Vise.
Cut, machined & welded a plate to an old trailer hitch insert. Mounted a vise on the plate. I'll use this vise for welding & the occasional field job.
Please don't laugh too much at my welds. I haven't done any stick welding for over 20 years.
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I always say it may not be a pretty weld but it is a strong weld. My problem is I don't have a magnifying lens in my helmet and can't seem to see as well as I used to.
 
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