dana gear
Hot Rolled
- Joined
- Feb 27, 2013
- Location
- Northern califorina, usa
Ours probably worked togather at Hunters point during WWII. There were a bunch of lathes out there back then. Little to huge.
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Ours probably worked togather at Hunters point during WWII. There were a bunch of lathes out there back then. Little to huge.
The op's question was about spindle taper, not test bars. Inadvertently, when searching for test bars, is how I figured out the taper.Test bars are not worth the expense for lathes ......you can very easily eyeball centres to check tailstock alignment......and all the test bars in the world wont tell you any more than a test cut ............save the test bars for setting up Universal Grinders .
That's interesting... never heard/read of a "stud" taper before, but definition matches what is there. I'll try and measure it more accurately today. I assume it has to do with clearances for the bearings while keeping the spindle stick out limited or some such...I went through this question myself a while back, and I'll quote what I wrote then:
"Talked to Brian at Miller Machine today. He told me there are two types of mt5 bores. One longer, and a shorter one, I believe he called the shorter a stud taper. Since my taper is 2.75" long he said it was the shorter, and as such would use a 15" test bar, with a 12" test portion. He said the longer taper could use a test bar a few inches longer."
I don't see anything about "stud" tapers here, but this is a handy chart:
Dimensions of Standard Tapers
This page give the dimensions of Morse, Jacobs, Brown & Sharpe, and Jarno tapers.littlemachineshop.com
If you want anything made for that taper, I'd recommend Brian Miller. Call 1 618 946-0793. Leave a message, he'll call back. Test Bars and spindle adapters, etc.
I think you may be right... I can't remember, but I'm guessing it is highly likely my brain short-circuited to "stub" by default. I'll try "stud" instead.You might be looking for a stub MT instead of a stud MT. I think the taper is shorter on the small end to retain the bigger hole through the spindle.
There may be a standard for how short or it may be to the manufactures convenience.
I Like your ground bar... it 2" in diameter? I have access to a Myford cylindrical grinder, so may have a go at making one at the end of the summer.Just speculation on my part. But on mine, a 16" swing, I think Monarch originally used an mt5 to mt4 adapter in spindle, to match the mt4 of tail stock. I say this because if I look at the specs, it says a 16" takes an mt4 center:
View attachment 395972
Then looking at my parts break down, part# C59 is listed as "spindle sleeve", and C60 as "center". But neither part mentions size:
View attachment 395973
For the headstock I had Brian Miller make mine with the mt5 stud taper, maybe in the vicinity of $250-$300 at the time. The mt4 for tail stock I got a cheap India made one from ebay or amazon maybe $40-$50.
View attachment 395974
You mean like this drill?Short tapers are /were quite common on large electric drills ...generally a short #2 or a short #3......back in the day when power tools had shiny aluminium casings......When I was selling a lathe with a spindle bushing missing ,I d simply cut up a Morse taper sleeve for the bushing..........early on I bought a big stack of spindle bushings at the army auctions ,and they got used as spacers for clamping on the radial drill table......then some years later the army lathes came thru the auctions stripped ,it was obvious where all the accessories had come from.
That thing reminds me of a 1/2 hp drill that once mildly kicked my ass. Twisted my arm like a pretzle and made me smack my face on a stud. Lesson learned, grab with both hands and be ready for the jolt.You mean like this drill?
This one actually has a full MT3 from what I can tell. It's stupid big.
View attachment 396157
I took another look at it again earlier today and it is 1.25 hp and 250 RPM... lolThat thing reminds me of a 1/2 hp drill that once mildly kicked my ass. Twisted my arm like a pretzle and made me smack my face on a stud. Lesson learned, grab with both hands and be ready for the jolt.
I watched one of those Utube videos from the Far East side where they wedged one like that between the tailstock and the turning part.
That thing looks to be 3/4 to 1hp.
Hopefully it has a variable speed motor. Not instant torque like old 1/2hp drill motors.
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