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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: Cast iron - 160mm dia
05/07/2019 17:41:23

Comparing the material properties may be interesting but I suspect that the real reason is that c.i. can be easily cast with a nice boss on the back.


Thread: Easy Button Die Storage Solution
20/06/2019 10:30:45

Worked for me for the last 20 years



Thread: Clock Domes (and display cases)
19/06/2019 11:52:46

Interesting link. Thanks,


Thread: Is CAD for Me?
09/06/2019 12:29:18

As far as I understand it, Fusion 360 is free to home users and start up companies and there is no time limit. While I understand the suspicions of some that this free availability is just a ruse to drag you in to the Autodesk fold before starting to charge but there is an alternative view that Autodesk know that home users will not stump up the money for a full commercial product so they have nothing to loose.

Fusion 360 is very much based on a 2D drawing model: Draw the plan in 2D and extrude the plan to make the 3D shape. As has been mentioned before, Paul McWhorter takes you through these steps very simply in his YouTube videos **LINK**

Whatever happens to the future of Fusion 360 or Alibre ( it does has a chequered history) I don't think any effort invested in these programs will be wasted since the overall concepts are the same.


Thread: WT2527 15cc Glow Engine
08/06/2019 21:02:00

Excellent, very nicely done.



Thread: Myford/ Drummond M Type chuck back plate.
08/06/2019 12:03:00

I don't think the clover plate needs to be made with extreme accuracy: It just needs to resist sufficient pressure to ensure that each jaw is firmly seated against the scroll, taking up the backlash.


Thread: The Workshop Progress Thread 2019
06/06/2019 17:12:52

Very nice. Looking forward to a video of it going.


Thread: Minnie 1"
06/06/2019 16:53:50


I don't know if you are aware but I believe it is usual these days to use some oversize rivets on the firebox sides to act as anchors for the horn cheeks. This photo from Jason's album shows what I mean



Thread: Quicksilver
04/06/2019 17:11:26

High vacuum diffusion pumps used to use large volumes of mercury. There were regular stories ( all apocryphal I'm sure ) about people trying to steal some from our establishment and being caught by security on the exit gate. They usually involved a push bike frame being filled with mercury and then being dropped and being too heavy to pick up or the bike falling apart because the mercury had dissolved the spelter joining the lugs to the tubes.


Thread: Is CAD for Me?
04/06/2019 12:25:01
Posted by ANDY CAWLEY on 03/06/2019 19:16:55:

Fusion advice, look for Paul McWhorter, i think I’ve spelt it right, on utube.

+1 for Paul McWhorter **LINK**. The problem I used to have with various 3D CAD programs was determining where I was in the drawing space. Fusion 360 made that very straightforward and I've gotten by but just watching the first couple of Mr McWhorter's videos has taught me loads about making the whole process easier.


Edited By JasonB on 04/06/2019 16:06:56

Thread: Warrington Model Engineering Developments
03/06/2019 18:02:31



Thread: Cast iron dust , is it really that bad for lathe beds.
02/06/2019 17:35:53
Posted by not done it yet on 02/06/2019 17:01:56:

Cast iron dust , is it really that bad for lathe beds.

The simple answer is “YES”. Would you add cast iron dust to your car engine oil? Thought not.

Neither would I add steel, brass, aluminium, chocolate sprinkles or ice cream. The skin on castings can consist of chilled iron and moulding sand, both of which are harder than other swarfs and best cleaned up fairly quickly but the inside of an iron casting or meeanite are pretty benign. I just clear up and oil when the job is finished. My Myford is still accurate enough after 30 odd years of tool and model making.


Edited By Roderick Jenkins on 02/06/2019 17:38:38

Thread: What are you using for Lathe Way Oil?
02/06/2019 11:53:05

I use a straight 30 engine oil as recommended in my Myford handbook.


Thread: Colchester Lathe Factory
01/06/2019 09:06:17
Posted by Bill Phinn on 01/06/2019 01:12:42:

The well polished, impeccably articulated commentary complements the machinery.

Sounds like the dulcet tones of William Franklyn, the ubiquitous voice over sound of my youth.


Thread: Minnie 1"
31/05/2019 14:29:46

I've got the oxyturbo set. The oxygen bottle only lasts about 10 minutes, so very expensive to run. Great if you need to get some spot heat into an awkward location like inside the firebox but no replacement for a propane torch. A normal propane torch should be fine for a Minnie boiler.



Thread: Turning between centres on a Cowells CW lathes
28/05/2019 13:21:39

Not difficult to make from an 8mm blank end arbor from RDG **LINK**


Thread: Do you wear a mask grinding HSS tool bits?
28/05/2019 13:16:04
Posted by Guy Lamb on 28/05/2019 12:56:16:

For some years now when free hand grinding steels containing Tungsten an extraction system has been mandatory (in most parts) of industry due to the possible inhalation of radio active Tungsten.

Are you sure that isn't just for thoriated tungsten TIG electrodes?


Thread: Warrington Model Engineering Developments
24/05/2019 17:34:52

Thank you. You never disappoint angel


24/05/2019 16:49:42

Michael Gilligan (MichaelG) is our resident search engine and patents hound. The Carlsberg of searching wink

24/05/2019 15:21:49
Posted by Clive Foster on 24/05/2019 15:06:25:

Not familiar with details of Myford construction but could the kit have included a replacement stud of smaller diameter allowing the 17 tooth gear to be fitted. Presumably with a sleeve to allow a standard gear to be used when needed.


That's my best guess. There is a patent number on the photo: Michael, where are you?  I think the whole thing is too well thought out not to have a solution.


Edited By Roderick Jenkins on 24/05/2019 15:24:42

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