Member postings for vic newey

If the rest of the lathe uses Imperial fittings, threads, etc, using Metric units may be counterproductive and confusing.

measure major and minor diameters, a carefully measured distance apart..

Convert your dimensions to Imperial and use those, to calculate in various formats..

The taper can be expressed in a variety of ways, Angle, Half Angle, Inches per Foot, Inches per inch.

the "Tool-n-Gizmos" website lists many tapers and their dimensions.

You may find what you require there.

Nothing on Lathes UK that helps?

Howard

Edited By Howard Lewis on 05/10/2022 10:39:09

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The lathe is of German manufacture but has an unusual mix of imperial and metric parts, so it has Whitworth fasteners, an 8 tpi mandrel thread but apertures for backplates, faceplates etc are 40mm metric. This was due to the Victorian era UK importers insisting on Whitworth threads.

Looking on tool-n-Gizmo I think the nearest similarity is a B-taper, a B18 has 32mm taper length as on mine

Vic

I would be tempted to first convert your measurements into all known ‘systems’ and then browse through this lot:

**LINK** http://www.tools-n-gizmos.com/specs/Tapers.html

MichaelG.

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For example, the taper could be expressed as a half-angle slope of 1:32

Edited By Michael Gilligan on 05/10/2022 09:53:23

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Thanks for replies, there's some types on that link I've not seen before, a B-taper might be the closest to mine, B18 has 32mm taper length

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I will take that as an emphatic NO then, Vic … and wash my mouth out accordingly

MichaelG.

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Apologies Michael , I didn't realise my reply sounded harsh, I just realised that the split in the casting being underneath would drip out any oil from the spindle unless the whole thing is upside down of course

… or is it conceivable that they are used to adjust the bearing to a ‘no shake’ condition prior to commencing work ?

MichaelG.

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The spindle is a perfect fit, no play whatsoever, the end play can be adjusted via the gear casting bolt.

I'm a little horrified that you suggest surgery on what might be a factory prototype or extremely rare item. There has been little time for less frequent readers of the forum to respond, and have you enquired on other forums? You might consider making the missing parts, preferably in the same style as the original, and adding other options.

My suggestion of it being a prototype is based on the second boss being unbored as I fancy that was for a bar to hold a tailstock as per the Myford dividing head. I also venture that the extra-long spindle indicates possible use as a slotter with the robust vertical bar being thus to provide a suitable fixing for the lever.

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Please, in the photo, are the two worms interchangeable? That opens the possiblity of having a low count worm wheel and a high count wormwheel.

To my eyes, one of the advantages of a notched-disk dividing plate instead of the more modern one with hole circles is that it could be used with a ratchet mechanism (e.g. like the cross feed on a shaper) driven from another part of the machine in order to advance a set number of notches. Have you ever seen anything like that?

In relation to the machines by Holtzapffel is the Pittler earler, later or about the same time period?

Please, in the photo, are the two worms interchangeable? That opens the possiblity of having a low count worm wheel and a high count wormwheel.

To my eyes, one of the advantages of a notched-disk dividing plate instead of the more modern one with hole circles is that it could be used with a ratchet mechanism (e.g. like the cross feed on a shaper) driven from another part of the machine in order to advance a set number of notches. Have you ever seen anything like that?

In relation to the machines by Holtzapffel is the Pittler earler, later or about the same time period?

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There is a one start and a five start worm with the dividing spindle which is easily exchanged.

My C3 lathes main drive has 7 worms instead of the normal three provided as standard so there are 1,5,6,7,8,9 and 10 start together with 20 wheels.

Some of my old Pittler catalogues show milling attachments with a ratchet mechanism using a notched disk, if you would like to see I can scan a page or two

Pittler lathes began with his first factory in 1889, I think that Holtzapeffel are earlier than that

Vic

I think it’s easy to see the same mind at work:

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MichaelG.

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And it has the same type of dividing spindle as on my Pittlers

Vic,

Please excuse what is probably a digression, but

Inspired by this puzzle to browse all things Pittler, I have just stumbled across his rather beautiful patent for a universal milling machine:

**LINK**

https://patentimages.storage.googleapis.com/77/13/64/7b1e6c7a2372d4/US580195.pdf

MichaelG.

Hello Michael,

von Pittler was an incredible inventor, over 200 patents were lodged by him. The worlds first vertical rotating capstan lathes that could hold as many as 30 tools changed production machines forever. Pittler still exist today with their 'revolver' lathes

I see what you mean! It has a very gentle helix angle though, and is definitely not a regular worm-gear.

I looked at the drawing Michael's link opens, of Pittler's patent-application for a universal milling-machine. That is festooned with worm-drives, so it's feasible that Vic's lathe attachment gives the some similar functions. Although the patent drawing shows the worm-wheels are clearly that.

There is another detail about it. Outside of the gear is what looks like a locking detent that engages a hole faintly visible on the second photograph. There appears only one hole in the wheel, and the detent does not seem a quick-release type.

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Vic - I reckon you'll have to carry out some careful experiments!

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I will indeed!

The hole you mention is for oiling the spindle as it goes right through

however here is a rare type of drum type milling head I got with the machine, it has a stem that fits in the saddle casting in place of the cross-slide and is powered from an overhead drive.

It has a cross-slide and and rotation of the drum and it's cutter via top handle. It's cutter can be turned to any angle and runs via the worm and wheel mechanism. Not got the overhead pulley set up so not tried it yet.

More likely a reduction in the material cost of the nut.

regards Martin

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The holes in that wingnut were made by a previous owner, the other one at the rear that locks the cross-slide stem is as original with no holes in it

The power cross-feed would be part and parcel of such use; but presumably also for plain turning. Though the universal-joints look rather close to their angular limits for consistent rotation: can their first shaft be set further back?

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The universal joint still works at acute angles and is intended to be used near the headstock end of the lathe, it's long shaft has a keyway slot that locates in the inline gear wheel so can slide along to it's limit. there is also a short further extension as in the photo below which shows a gear fitted on the end of the cross-slide stem for ball turning

Thanks, Vic. That's a lovely looking machine. I have a Britannia which must be a smilar vintage and shares some of the styling of the period and (before I painted it an inappropriate grey) a black finish. But a much less sophisticated machine, although it sounds similar when running.

Bill

Vic, I didn't make clear that I was referring to the slide at the bottom of the attachment. The surprising feature for me is the small worm and wheel, is there a ratchet that operates it? I can't see a micrometer dial to indicate the amount of travel.

Bill

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Hello Bill,

the worm and wheel are for power cross feed via the universal joint, because the leadscrew is inside the bed this is how von Pittler got around the problem. The machine also has a power circular feed using the same UV

here is a video of me testing it out Power cross-slide on the Pittler C3