Member postings for ega

Light bulb moment: running the tool upside down at the front would deal with my visibility problem - thank you!

Jason B:

You have not mentioned this in vain.

However, the direct import Chinese tool-holder I used to try this would, I think, only be usable with relatively short threads. I was surprised by how well this method worked given that the tool seems to be working the wrong way round in relation to the helix angle of the thread.

I found also that the work is more difficult to see working like this and it was obviously necessary to be very disciplined about moving switches and levers in the appropriate direction.

Roger King 1:

Here is the photo I promised:

Each jacking screw cum raising foot consists of a length of large diameter studding with the upper end tapped 5/16" BSF, a short cylindrical foot of about 1.5" diameter, two nuts to suit the studding and the 5/16" hold down bolt and washer. The lathe foot sits on the adjustable upper nut (not on the studding) and is held down by the bolt.

Thinking about this at many years' distance from when I did it, it seems clear that the cylindrical feet must be tapped to suit the studding, the lathe tray and underlying structural member being firmly gripped between the foot and the bottom nut.

I hope this is clear!

I have sent you a PM

This post by Peter G.Shaw refers to my favoured solution:

https://www.model-engineer.co.uk/forums/postings.asp?th=39150

I have a variation of this method on my Super Seven: it is effective and a good deal cheaper than the Myford offering.

It's normal for the initial interrupted cut to be noisy. You could consider taking off the flats with a front-mounted HSS tool at slower speed and then move to the RTP at your favoured speed and feed.

Interesting that after ten years you are still using the same blade which suggests that the machine has been very lightly used.

Incidentally, I assume this is the Warco product.

Are you using a suitable cutting oil or paste?

I would certainly try the collet.

How about screwcutting?

The "spare jaws" for the three jaw chuck are likely to be reversed configuration jaws which allow larger items to be held.

Good luck with your machine; it's seems to be well-equipped.

Good to know and a relief from some of the overreaction to safety legislation.

Namely? I have been wondering about this myself.

Good idea but could you buy an electrical appliance in such a place?

The set of four supporting my (unbolted) 500KG lathe came from Warco.

Incidentally, that weight does not include the ballast I have loaded into the cabinet.

Before getting a larger lathe I made and fitted a 9" flywheel to the quill of my mill/drill. This was made from black MS but the idea came from someone who had used a brake disc for the purpose. Mine was faced on the Super Seven by bolting to the faceplate. The finish is adequate but far from perfect:

Another job in the Myford just fouled the ends of the shears and I confess I trimmed them to clear it:

This is not to suggest that I would encourage the OP's suggestion!

Edited By ega on 24/04/2019 15:45:51

Jeff Dayman:

That problem with the title *might* be caused by an adblocker (if you are using one).

Despite these apparent faults the book has an impressive printing history and I note that it is bound in "signatures", a sign of good quality, although the method does perhaps facilitate this kind of fault.

As a reference work, it seems possible that many will never notice or suffer from its omissions or duplications.

Plus one for a complete third edition although an earlier edition came with a sheet of numerous errata, probably spotted at a late stage by TC himself.

Worth checking if buying a used early edition.

Studying the patent with great interest; it answers my query about the folding process, of course. I note that you were your own agent!

Alan

Thanks for the further comments and information.

Might you provide a link to the patent documents? Your point about needing to protect your design before showing it reminds me of the experience of Andrew Ritchie when he was developing the Brompton - a long and rocky road.

Gearing and crank length go together of course. I believe that cranks as short as 100mm have been used by experimenters. Being able to put both feet to the ground without leaving the saddle is a strong point for "minimum mode" users.

I take it that you could incorporate an epicyclic hub gear in the rear wheel if necessary but this would add relatively significant weight; the present low weight is a strong feature. I endorse your comment about the difficulty of carrying a folded Brompton. A motor and battery would add even more weight although the hub gear could be dispensed with for "minimum mode".

Is the gas strut intended to provide suspension? The plain bearing main pivot on the Brompton is a weak point although it seems not have hampered its great popularity. The rear suspension on the Brompton can be tuned by using stiffer or softer media. Some years ago they altered the front frame hinge effectively increasing the wheelbase by about 30mm which I think had a beneficial effect on the ride (I have owned both types).

More than a step ahead!

Given the expense and complication of the patent process, I assume you are serious about production. Your experience of the main stream bike industry is fairly typical I think. At first sight, your vastly impressive design appears to use only two standard items ie the saddle and one pedal (? brakes and bar grips).

I think that 50" would be OK for some of the purposes mentioned by John Olsen but a utility folder really needs mudguards and luggage capacity.

I like the rectangular seat tube which does away with the need for radial adjustment when unfolding.

Position on bike is both personal and use-dependant. It looks as though the rider on your machine will be sitting almost directly over the rear wheel; how does it perform on hills?

Those elegant disc wheels are no doubt your own design and manufacture. I did wonder about their lateral stiffness.

I hope you will keep us up to date with your progress in the refinement of this most interesting project and perhaps post a video of the folding process.