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John Stevenson
01-08-2009, 06:27 PM
The other day Mac had us dribbling and slathering over his new toys as told in this thread.

http://bbs.homeshopmachinist.net/showthread.php?t=32096

Note in the pictures in post #8 there is a chrome screw to the right of the cross slide hand wheel.
You can be forgiven thinking that this is a lock for the dial, it isn't, the lock is the catch on the face.

Neither is it a lock to lock the slide.

It's true purpose is to enable quick threading, or rather quick retract.

Infeed on these for a full turn is 0.125" radial or 0.250 " on diameter, now 1/8" radial may not clear some of the deeper pitches so they built a disk mechanism inside to allow it to do nearly two turns, more than enough for any depth of thread that the machine can handle.

Here's the build up if anyone fancies copying one.

http://www.stevenson-engineers.co.uk/files/screwcut%20stop2.jpg

This is the dial pulled off. The dog to the right is fixed on the dial, the centre one and one on the left are free to turn.
The centre on is extra wide so it can catch both.

How it works is you screw the chrome screw in and wind the cross slide in nearly two tuns so it catches both washers and then hits the fixed stop. You then use the top slide, slewed round to 29 degrees to apply the cut and start the thread.

At the end of the thread you wind the cross slide out until it's clear, no need to watch any dials.
Wind back to the start of the thread, wind cross slide back in until it stops and put fresh cut on with topslide, do pass 2 etc

Very quick as you are only watching to top slide dial for infeed distance per pass.

http://www.stevenson-engineers.co.uk/files/screwcut%20stop3.jpg

View inside with both washers off, it's a very simple mechanism but very effective for doing threads fast and foolproof .

.

motorworks
01-08-2009, 07:54 PM
John
Nice, but you are not going to get as many hits as the 'cherry wood lathe with the DRAC'!
;)

John Stevenson
01-08-2009, 07:59 PM
Or the 'precision' acme screw with plastic nut off a trailer park satellite dish :rolleyes:

.

BadDog
01-08-2009, 07:59 PM
Rockwell's have a similar mechanism, but even simpler. Just a wide inverted "V" shaped piece with a pivot at the point. Then there is a pin on the back side of the dial shroud (away from operator). Normally, that pin is pulled out and does not engage the "V". But push it in and crank the cross slide in until it stops against the "V. See, the first time past the "V", it just rocks over, but it will block passage the next revolution, and that stops the crank. When you want to crank out at the end of the thread, again, first pass of the "V" past the pin and you it just rocks over so that the next pass is blocked. Reset to start of thread, run cross in two turns till it stops, and you're ready to set the in-feed on the compound for the next cut.

I do miss that feature on my new lathe. Perhaps a project???

BillH
01-08-2009, 08:06 PM
Those washers are the same thing in my L1011 Trim assembly for limiting the amount of travel the hand cranks will turn.

dp
01-08-2009, 08:21 PM
I take it the tab on the left most ring contacts the chrome screw end or is there a stop block attached to the screw?

beckley23
01-08-2009, 10:26 PM
Your "Lock Collars", that's what Monarch calls them; the flat one should be in the center between the folded ear collars. The ears catch on the center collar. The outer collars catch on pins in the dial and cross feed bushing. The cross feed bushing has the actuating pin screw.
The following pictures are of the same assembly for a Monarch Series 60 16" lathe.
http://img.photobucket.com/albums/v152/beckley23/se50.jpg

http://img.photobucket.com/albums/v152/beckley23/se51.jpg

http://img.photobucket.com/albums/v152/beckley23/se52.jpg

http://img.photobucket.com/albums/v152/beckley23/se53.jpg
Harry

dp
01-08-2009, 10:46 PM
Rather like a 3-digit combination lock. Nice idea.

lazlo
01-09-2009, 01:07 AM
Thanks for those pictures Harry! Looks like it would be a fun add-on project.

kvom
01-09-2009, 08:57 AM
I have that on my 10EE, and didn't understand what was happening until recent posts on this feature. The stop point is always the same position on the graduated dial (not 0 as it happens).

daryl bane
01-09-2009, 11:06 AM
I will foolishly assume that the slight taper on the end of the engaging knob is to allow a slight adjustment in the dial marks. So you can really zero up the lines?

hoof
01-09-2009, 06:40 PM
I saw that feature for the first time the other night when watching the videos from MIT that someone posted on the board. I thought it looked like a 10EE. I was wondering how the did that. :confused: Now I know.
Thanks.

beckley23
01-09-2009, 06:50 PM
Daryl,
Which taper are you refering to? There's a cross sectional view of the telescoping cross feed screw assembly in the EE manual.
Harry

John Stevenson
01-09-2009, 06:53 PM
I have that on my 10EE, and didn't understand what was happening until recent posts on this feature. The stop point is always the same position on the graduated dial (not 0 as it happens).

It does if you zero the dial :D

.

daryl bane
01-09-2009, 11:41 PM
Harry, the end of knob EE3432. It has a tapered end (mine does). Seems that if you screw the knob in or out, when its fully engaged, it will move the zero point alittle each way set the dial dead on.

Spin Doctor
01-10-2009, 01:20 PM
The LeBlond Regals I used to run had a similiar feature. One thing about these stops though is when you crank the cross slide back in don't slam it into the stop. They can slip a little bit. When threading multiple parts it can cause problems if you don't watch out for it.

beckley23
01-10-2009, 02:50 PM
Daryl,
I think you're correct about the tapered end on the knob. I'll check Monday to be sure. I haven't used the stop that much, one production job I had about 1-1/2 years ago when I was rough turning a steep taper on some parts before heat treat, where accuracy wasn't critical.
I do remember looking at the DRO while using the stop, and the repeatability was excellent, and I wasn't being gentle.
Harry

rkepler
01-10-2009, 09:32 PM
I have that on my 10EE, and didn't understand what was happening until recent posts on this feature. The stop point is always the same position on the graduated dial (not 0 as it happens).

If it's stopping on 125 it's because it was misassembled 180 degrees out. That happened to me a couple of times.

Also, in setting the cross slide 0 it's easier to unlock the dial before setting the stop. That way you can set the compound on zero and run the cross slide in to the stop and let the dial slide on 0 until the tool just touches the work, then lock the dial. That way you have both the compound on 0 and the cross slide on 0.

Now, if there was just something keep me from cranking the cross slide out on an inside thread....

Mark McGrath
01-11-2009, 04:38 AM
I`ve always wondered what that screw did.Now I know and didn`t have to read the book.

John Stevenson
01-11-2009, 06:25 AM
Also, in setting the cross slide 0 it's easier to unlock the dial before setting the stop. That way you can set the compound on zero and run the cross slide in to the stop and let the dial slide on 0 until the tool just touches the work, then lock the dial. That way you have both the compound on 0 and the cross slide on 0.

Now, if there was just something keep me from cranking the cross slide out on an inside thread....

Russ,
Am I missing something as mine works both ways, it's just a mult turn stop after all.

kvom
01-11-2009, 08:57 AM
If it's stopping on 125 it's because it was misassembled 180 degrees out.
That's what it's doing. Thanks.

beckley23
01-12-2009, 06:22 PM
Daryl,
I checked the SE 60's screw today, and it does have a tapered end. The only reason I figure for the taper is to give a solid full contact with the ear of the collar.
Harry

rkepler
01-13-2009, 10:18 AM
Russ,
Am I missing something as mine works both ways, it's just a mult turn stop after all.

Mine works both ways as well, at least it does when I've set it up. Maybe what I really need is someone to stand next to me to make me set things up right on the lathe, even when it's "just one part" and "hardly worth the trouble".

daryl bane
01-13-2009, 10:25 AM
Harry, On mine and Tims, if you turn the knob after engagement, it will move the zero point about a thou.

beckley23
01-14-2009, 06:20 PM
Daryl,
Did a little checking today, my EE and the SE 60, I didn't check the other 3, both miss the 0 point by .001" in both directions. The only thing I can figure out is that the stop pin in the dial is a little small, or the folded ear is a little narrow. Considering that there 3 collars and 2 pins (I'm considering the screw as a retractable pin) interacting, I'm not going to complain.
I guess one could play with the engagement depth of the screw to see what happens.
Harry