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Member postings for Roderick Jenkins

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

Thread: Arbor for No.0 Jacobs Chuck?
13/02/2020 16:41:18

Just to confirm that 0 chuck takes a 0 Jacobs Taper. I turned one on to the end of the spindle for the drilling head on my George Thomas pillar tool.


Thread: How to do 100 divisions
10/02/2020 22:10:43

In which case Dave, perhaps these pics will give some ideas:





10/02/2020 17:15:09

OP says his lathe has gearbox...

Thread: J'accuse
07/02/2020 19:23:29
Posted by Howard Lewis on 07/02/2020 15:51:21:

I couldn't remember the Gospel, Chapter and Verse.

Nor could I but Google could wink

Thread: What bench drill
07/02/2020 15:58:11

When I bought my pillar drill Jet were the only ones to specify a run out on the quill. At least it gives you something to complain against. I'm actually very happy with mine.


Thread: J'accuse
07/02/2020 15:49:23

"He that is without sin among you, let him first cast a stone at her" John 8:7

Thread: Linked belt for Myford 7
07/02/2020 15:39:51

I'm very happy with the powertwist belt on my S7. As we often find, high power industrial practise does not always transfer well to our tiny, low powered machines.


Thread: How do I change the "default" lever angle on my Verdict DTI?
02/02/2020 10:20:00

The design of the T4A seems so different to other Verdict gauges that I wonder if it was intended to fit into a specific bit of equipment. The round body with the flush screw suggest it could be held in a hole so perhaps there was no need to change the direction or angle for its intended application.


Edited By Roderick Jenkins on 02/02/2020 10:23:04

02/02/2020 09:02:21

Have you tried turning the screw on the side clockwise?


Thread: lefthand acme thread
27/01/2020 19:58:23

Might be worth thinking about making an acetal nut **LINK**


Thread: Black & Decker Band Saw
25/01/2020 22:41:18


Thread: cam gears
24/01/2020 16:10:23

HPC will supply your needs


Matador wants 48DP 10 and 20 crossed helicals


Edited By Roderick Jenkins on 24/01/2020 16:17:57

Thread: Ian S C Back again
21/01/2020 12:12:00

Good to see you back. We've missed your wise words.


Thread: A good toolpost drill design
20/01/2020 10:41:00

A bit more discussion on these Here

20/01/2020 10:19:11

I made mine from a plain shank er11 collet holder, a pair of angular contact bearings and a 200w 240v treadmill motor.


Thread: Black & Decker Band Saw
19/01/2020 20:45:52

These people may be able to help **LINK**. Blade length is 59 1/2 "



Thread: Betelgeuse in Orion
18/01/2020 23:19:34

After 4.2 x 10^15 miles the base of the cone will have a considerable area...


Thread: The Workshop Progress Thread 2020
15/01/2020 23:04:51

MAP ( note the one P ) is readily available. It is mostly propylene and is sold as a substitute for MAPP since it burns a bit hotter than propane but does not have the other desirable properties. Acetylene is probably the stuff to use for these atmospheric engines. Calcium carbide seems to be available so making a simple generator shouldn't be beyond the wit of an engineer.


Thread: magic 127 TOOTH ?
13/01/2020 09:51:01

In the "good old days" an 8tpi imperial lathe was commonly supplied with a set of change wheels - typically 20-65 in 5 teeth steps which would allow the cutting of any desired imperial screw thread. There are 151,200 permutations using any 6 of these 10 gears for drivers or drivens*. Finding a combination of these gears to give the correct pitch for a metric thread needed a systematic approach, hence the use of a 127 gear or the 63/100 ratio. However, in these days of computers we can can look at all those permutations very quickly and pull out a result that is close to the one we require - as in the table below:

basic gear set metric apprx.jpg

The maximum pitch error is 1 micron.

*not really true since a driver combination of 20,30,40 is the same as 30,20,40 but a bigger number always looks impressive wink


Thread: Scaling the Eureka
10/01/2020 17:51:02

The Eureka device obviously creates a lot of interest. I was astounded to see that my video of the device in action has had over 10,000 views surprise



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