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Member postings for john jennings 1

Here is a list of all the postings john jennings 1 has made in our forums. Click on a thread name to jump to the thread.

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Thread: Fastners in Birmingham
11/10/2011 13:55:35
The above link doesn't seem to list any LH items.
 
Try stainlessautomotivefastenings.co.uk which will provide LH even if on a "bespoke" basis which costs! Also only interested in making mall quantities.

Googling "Left Hand ......." seems to suggest that nuts and to a lesser extent studding is more freely available.



Happy hunting!


John
Thread: MEW180 CAD Article
11/08/2011 10:22:14
It is all very pretty but it is basically a rough sketch of a possible lathe attachment.
 
Considering the task that the gadget is designed for it looks a little light in construction.
 
Only actually making it will show exactly what it can do and it seems gross waste of MEW pages which could well have had an outline of actual construction and performance.
 
While I am being grumpy the same analysis applies to the cutter grinder in a previous issue.
This although based on a made object avoided discussion of what seemed to be the main item of interest - the use of a Diamond faced wheel and any costructional detail.
Thread: Tool Centre Height
06/08/2011 15:31:54
I use a simple system advocated by John Wilding the Clockmaker.
 
Take suitable length of free cutting hexagon bar (1/2" AF plus ) face off one end.
 
Mark off the required length equal to the centre height above the lathe bed and face to this length. Then stand the bar upright on the cross slide upper surface and remark centre height. Turn the length above this cylindrical and a little smaller diameter than the AF dimension.
 
Use either full or reduced height to set the turning tool depending on which location is most convenient.
 
Repeat for your second lathe.
 
Simples
 
John

Thread: More clock stuff
01/06/2011 11:22:25
I tried Norman's link to Meadows and Passmore's online store.
 
The good news is that a mains spring winder is available to order:
The bad news is that it is priced at £600!
 
Another avenue is to make one, John Wilding has a design in his "How to repair Antique Clocks" Volume 2. (a lot of other clock tools as well).
 
all the best
 
John
 
 

Thread: help with seeing
08/09/2010 19:48:45
As I have aged my eyes have become increasingly reluctant to focus over a wide range, particularly very short distances, so that fine graduations become unreadable.
 
A first try at a solution was a pair of bifocals: top  focus 2-3 feet , bottom focus 1-2 feet.
They had merits but the overall range was limited and the interface between top and bottom often tricky.
 
My current "solution"  is  essentially Peter G Shaw's computer varifocal pair. Sold as "Office Varifocals"  they give a blurred distance vision.  They also cope with an inflexible neck requiring less articulation to select the optimum sightline.
 
For close viewing of detail I recommend the Kaiser pocket magnifiers with integral led light .
Thread: Compact 5 lathe questions
01/06/2010 16:09:22

I have had a Compact 5 for some twenty years.

 >>

The mazak/plastic combination works well even in the long term.

 >>

The major design fault is the feed nut on the lead screw. I have replaced this once with a second replacement overdue. The lead screw itself does not seem to wear but the mazac nut does. I have toyed with making a “proper” split half nut brass or bronze (or splitting the original mazak nut. I have however always faltered at making a suitable LH tap to match the lead screw.

 >>

I operate the saddle feed using a speed controlled reversible DC motor

 >>

I have always been a bit disappointed with the mill/drill attachment which is a bit lightweight ; even on a dedicated XY table rather than the lathe.

 >>

You may be interested in a slow speed banjo to give reduced spindle speeds (200 rpm is a bit fierce for screw cutting) and a lever operated tailstock in old issues MEW.

 >>

I also found a simple banjo for LH  threads useful and saved me designing one (also in an old issue)
Thread: Clockmakers Depthing Tool
23/12/2009 14:01:34
Wow is it that long ago that I wrote A Clock Depthing Tool  91/92!
 
It won't help David Carne  as it is of fabricated construction.  (I couldn't figure out how to drill/ream the parallel holes needed on a solid construction. )
 
It was made using a Unimat 3 and milling head and isl argely of aluminum alloy.
 
The use of alloy keeps the weight down considerably.
 
 
regards John
 
 
 
 
Thread: "Precision" or "does NOT do what it says on the tin"
12/11/2009 15:25:15
from John 1
 
About four years ago I bought spare E16 collet chuck from Chronos.
 
On trying it out with a round  HSS tool bank and on more than one machine it was clear that there was a pronounced wobble - visible to the naked eye!
 
I asked for and got a replacement that had virtually unmeasurable runout ?
 
It was completely unclear to me how the original chuck  could have ended up like this (or how it had passed an inspection).
 
The moral must be that it may not be your fault but that of the particular item in question,unless you are expecting an unreasonable level of accuracy. Above all check before irreversible "remedial action" is begun.
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