Tailstock Turret Plan from MEW 253 – FOR DIGITAL SUBSCRIBERS

[Neil WyattModerator @neilwyatt]

Because Digital-Only subscribers may have difficulty accessing and viewing such a large plan, we have made it available as a PDF through the subscriber-only article linked here.

http://www.model-engineer.co.uk/news/article/free-plan-for-subscribers-to-accompany-mew-253

Please note you must have a valid subscriber number entered in your profile to view the article and download the plan.

Purchasers & subscribers of papers magazines will get the full size paper version.

Paper subscribers may also download the electronic version from the above link.

Please respect our copyright and do not circulate the plan to others.

Neil

[Neil WyattModerator @neilwyatt]

Full size digital download

[JourneymanParticipant @journeyman]

Downloaded the PDF nice design unfortunately not much good for my lathe as no hole through the tailstock for a draw-bar. Would it work just relying on friction to keep it in place? Any other cunning retention plan?

John

[John Stevenson 1Participant @johnstevenson1]

Neil,

First page reads Issue 2653 and not 253.

Thank you for the plans.

[Michael GilliganParticipant @michaelgilligan61133]

Isn't WiFi 'bus technology wonderful …

I'm on the 'bus going home from Manchester, and have just downloaded the plan in about fifteen seconds, and saved it to GoodReader on the iPad.

Thanks, Neil

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Journeyman on 15/03/2017 16:57:07:

… Any other cunning retention plan?

.

638 Loctite

MichaelG.

[JourneymanParticipant @journeyman]

Michael, Ah yes but a trifle permanent if you need to use the tailstock for something else

[John Stevenson 1Participant @johnstevenson1]

I already have a couple of these but commercial units and they just stay in by the grip of the Morse taper.

I can't fit a drawbar either so I cannot see any problem with this design at all.

End of the day bearing in mind we have the drawings only, you drill and ream the holes in the turret from the headstock so you guarantee alignment.

[Neil WyattModerator @neilwyatt]

If you think about it, the loads are no different than on tooling held direct in the tailstock. My lathe hasn't got a drawbar hole either.

Neil

<edit> Actually the Adept has got a drawbar hole, which I suppose underlines its superiority

Or perhaps it's where you thread the anchor rope.

Edited By Neil Wyatt on 15/03/2017 17:55:13

[John Stevenson 1Participant @johnstevenson1]

Posted by Neil Wyatt on 15/03/2017 17:54:01:

<edit> Actually the Adept has got a drawbar hole, which I suppose underlines its superiority

Or perhaps it's where you thread the anchor rope.

Edited By Neil Wyatt on 15/03/2017 17:55:13

.

LOL.

[JourneymanParticipant @journeyman]

Posted by John Stevenson on 15/03/2017 17:13:07:

I already have a couple of these but commercial units and they just stay in by the grip of the Morse taper.

I can't fit a drawbar either so I cannot see any problem with this design at all.

Thats alright then, might give it a go once I have read the article.

John

[JasonBModerator @jasonb]

That has worked out quite well as a PDF, better than having "fold" lines where you don't want them has it been done on digital. Even though A2 it is easy enough to zoom and scroll to the part you want and print "actual view" and get it on bits of A4. Also does not get pixilated when you zoom in like it would as a mag page.

J

PS. Now you just need to work out a way to cut and past that 252 red triangle

[Neil WyattModerator @neilwyatt]

[Mark RandParticipant @markrand96270]

Just noticed that the (printed) drawing shows an M12 thread for the MT2 arbor and angle piece that it attaches to, whereas the article text quotes M10 for both.

Not near a measuring stick at the moment so haven't attempted to scale from the drawing.

[Ex contributorParticipant @mgnbuk]

I cannot see any problem with this design at all

There are a couple of points that don't seem great to me :

The index pin is parallel – this will have some play when new & will wear looser. Commercial designs use a tapered pin to take up wear ?

The angled block is located with countersunk screws only – better to have made the angled block with a bigger footprint & use pins for location, or to have fitted the block into a closely machined recess in the back of the body ? Unless using fitted bolts to give a location and fastening in one, isn't it usual to use fasteners to hold things together and pins, tenons, spigots etc, to give a positive location ?

Nigel B

[JasonBModerator @jasonb]

Posted by John Stevenson on 15/03/2017 17:13:07:

I can't fit a drawbar either so I cannot see any problem with this design at all.

Quoted out of context, John was refering to retaining the tool by the MT alone not the whole design.

[Gary WoodingParticipant @garywooding25363]

I got 4 copies of the plans with my subscription.

[John FlackParticipant @johnflack59079]

As no more than an amateur, whose lathe is no more than modelling eqpt, with no intention of professional usage, thus my time is free. Purchasing several tail stock chucks and inserting tooling for sequential use seems a simpler solution. No doubt the great and the good will inform this sinner otherwise. But it works for me

[Neil WyattModerator @neilwyatt]

Posted by John Flack on 23/03/2017 10:30:49:

As no more than an amateur, whose lathe is no more than modelling eqpt, with no intention of professional usage, thus my time is free. Purchasing several tail stock chucks and inserting tooling for sequential use seems a simpler solution. No doubt the great and the good will inform this sinner otherwise. But it works for me

It won't suit everyone, the more operations and the more parts you need to do, the more useful it becomes.

Obviously when you get to a certain point you might then think of moving up to a capstan lathe, and beyond that an automatic or CNC.

If you don't do a lot of repetitive work and have plenty of time, it's not for you.

Neil

[Neil WyattModerator @neilwyatt]

Posted by Gary Wooding on 23/03/2017 10:02:48:

I got 4 copies of the plans with my subscription.

Will you be returning them or shall I send you and invoice?

Neil

[Flying FiferParticipant @flyingfifer]

Neil, I`m struggling to make the detent assembly from the detail parts shown on the drawing. Can you also tell me what the purpose of the "finger" and the "flag" please.

Regards, Puzzled Essex

[JourneymanParticipant @journeyman]

The "finger" and "flag" appear to be spurious drawing artifacts that have appeared somewhere during the publishing process, just ignore them, should look like:-

The other parts for the detent plunger and cover seem to be quite clear and suitably dimensioned.

John

Edit: Add Image

Edited By Journeyman on 23/03/2017 16:51:04

[I.M. OUTAHEREParticipant @i-m-outahere]

Posted by Neil Wyatt on 15/03/2017 17:54:01:

<edit> Actually the Adept has got a drawbar hole, which I suppose underlines its superiority

Or perhaps it's where you thread the anchor rope.

Edited By Neil Wyatt on 15/03/2017 17:55:13

I thought that hole was to look through to check if the bed had twisted !

Not much use as an anchor as sh#t floats

[MWParticipant @mw27036]

Very pleased with this article so far, definitely the sort of content I like. And i'd jolly well like to have a go at making this one once I get my hands on some large diameter steel.

The main obstacle I have to overcome with my particular lathe is the differing taper sizes, my tailstock is an MT3, and doesn't have the same amount of clearance on the face of the tailstock (which is formed to a square, straight edge rather than tapered off like on the demo lathe). I'm sure a longer angle piece could project the large diameter far away enough to not cause problems rather than hacking at my own tailstock!

I have looked at the drawing and I understand enough of it, to realize that the secondary indexing big piece of steel would require a locating hole for each tool position (although not explicitly drawn on there!). This amounts to simply having to lift the pin out of the locating hole and swivel over to the next available position. Probably the best way to locate it as the turret isn't able to swing or move about as you use it, like you might get with a large gear and pawl.

Very interesting indeed, well done to the author and the magazine for getting it together!

Michael W

Edited By Michael-w on 23/03/2017 17:25:53

[Author]

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