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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: Myford Dickson toolholder and 10mm tooling
19/02/2019 09:53:49

I've milled the bottom off 10mm tip holders but I don't think this is a fault of the tool holder manufacturers. I imagine that the holder was designed to hold a maximum 3/8" (9.5mm) HSS tool. There is quite a lot of variation with tipped tools, depending on how deep the tip sits in the tool and the thickness of the tip itself, making 10mm tip holders marginal even in original Dickson tool holders. I think 8mm tipped tools are probably a better choice for Dickson equipped 7 series lathes.

Cheers,

Rod

Edited By Roderick Jenkins on 19/02/2019 10:04:12

Thread: New coffee maker - disgusting taste!
17/02/2019 16:35:04
Posted by Mike Poole on 17/02/2019 15:57:12:

Absolutely! And the cream goes on first then the jam.

Mike

No dogma here please. A proper engineer will determine whether the cream or jam is the more viscous and then apply the thicker of the 2 first, thus enabling consistent layering of the 2 components.

smiley

Rod

Thread: Potting Adhesives : for Glass Fiber/Fibre Optic Bundles
14/02/2019 08:45:33

Michael,

When I was scouting around looking for a metallurgical potting compound for home use I plumped for this stuff via Amazon **LINK** It sets hard and doesn't interfere with the grinding and polishing of the specimens. Actually it polishes up very nicely itself and seems very similar to the professional (expensive!) products I used to use in a former life.

Hope this helps,

Rod

Thread: print-offable and laminatable chart
03/02/2019 13:01:07

Guy,

These are from Bradley's Series 7 Manual:

myford imperial.jpg

myford metric.jpg

 

changewheel setups.jpg

HTH,

Rod

Edit:  Forgot to add the setups

Edited By Roderick Jenkins on 03/02/2019 13:08:04

Edited By Roderick Jenkins on 03/02/2019 13:08:55

Thread: Myford Change Wheels
01/02/2019 20:38:34
Posted by not done it yet on 01/02/2019 20:05:12:
Do you mean you cut them all separately? Or was it one long cut and then parted off?

rolls milling.jpg

smiley

Rod

01/02/2019 10:41:51

Chaps,

I accept the collective wisdom of the desirability of cutting the teeth in one pass but can somebody please explain to me the mechanism of more than one pass blunting the cutter?

In my case a combination of the power of my mill motor and the slowest speed of my auto table traverse, not to mention the noise from the back gear, led me to be more comfortable with 2 passes and the cutter (which I assume is Chinesium) still seems to be sharp.

Cheers,

Rod

Thread: Fitting a Reversing Switch to a Motor on a Myford Lathe
01/02/2019 10:34:34

Mike,

This scan from The Model Engineer's Handbook seems to show a similar situation to yours although this is a connection diagram for Crompton Parkinson motors.

motor connections.jpg

HTH,

Rod

01/02/2019 08:25:24
Posted by Mike Donnerstag 1 on 31/01/2019 20:09:25:

I assume a VFD with a new 3-phase motor would be around £400?? Also, do the VFDs all create that horrible high-pitched whine?

Mike

The whine is a function of the carrier frequency and can usually be adjusted by selecting the correct parameter on the VFD . This **LINK**

explains it better than I can.

Rod

Thread: Myford Change Wheels
31/01/2019 21:02:40

Pretty much anything will be probably outlast us but I chose FC steel for these " Myford" gears ( actually for the GHT bending rolls). They cut pretty easily with 2 passes of an RGD cutter.

rolls gears.jpg

Rod

Thread: Countersink choices
30/01/2019 09:16:17

I've been very happy with these single flute countersinks **LINK**

Rod

Thread: Myford 33t and 34t gears for metric threads
28/01/2019 09:51:28
Posted by Lambton on 28/01/2019 09:32

I cannot understand why anyone would find the need to screw cut BA threads as a good set of taps and dies together with a tailstock die holder will do a very good and accurate job. In almost 60 years of model (and full size ) engineering I have never known anyone screw cut a BA thread.

Eric

I agree. I use dies for anything smaller than M6/0BA but die cut threads can be wobbly so the information is out there for anybody needing it.

Rod

28/01/2019 09:37:47
Posted by Mike Donnerstag 1 on 28/01/2019 09:23:25:

Hi Ian,

Is Adam related to John? How can I contact him?

Many thanks,

Mike

Adam runs the homeworkshop.org.uk website. A request on there for 33 and 34 tooth Myford change gears might do the trick.

28/01/2019 09:30:50

I don't think 33 and 34 tooth gears were ever part of the old Myford inventory. I got mine from the late, great John Stevenson. Shortly before his sad demise Sir John mentioned on this forum that he was making a batch of gears - I wonder if these were for RGD Myford? If so it seems that they are running out. Perhaps there is an opportunity for a little entrepreneurship here.

Rod

27/01/2019 11:15:09
Posted by peak4 on 27/01/2019 10:59:37:

Can't see any on ebay at the moment.
Try HPC Gears, who offer 34t 20dp in metal and Delrin.
OK would need modifying to fit, but probably easier than making from scratch.

Bill

We need to be a little careful here, Myford change gears are 14.5 degrees pressure angle.

Rod

27/01/2019 11:08:12

Mike,

Just for interest I calculated the actual pitch achieved using the official Myford metric conversion set for the gear box. The actual figures are in the right hand column:

myford gbox metric.jpg

A similar calculation for the 33/34 option is shown below

metric approximations.jpg

So, the official set is an order of magnitude more accurate but for practical purposes the difference is negligible. For the finer metric threads some additional gears to the 33 and 34 are useful. I have the metric conversion set, it came withe my S/H lathe but when I needed to cut a 16mm x 2 thread last week I broke out the 34T gear. Much more convenient.

HTH,

Rod

Thread: Occasional usage Sand blaster
22/01/2019 17:13:12

I shall look forward to it smiley

Rod

Thread: Pultra P type 8mm nose thread
20/01/2019 18:01:53

22 x 1 mm looks awfully close to the 7/8" x 26 on the 10mm collet 1750/1770 lathes...

Rod

Thread: Involute, Circular Gear-Cutter on Eccentric Arbor...
16/01/2019 10:23:03

John suggested using a Conecut **LINK** It's a neat solution to making a single point cutter but more difficult for a circular cutter.

Rod

Thread: Model Engineers' Day at the Forncett Steam Museum
12/01/2019 11:54:11
Thanks for the info guys.

Bill, I'll send you a PM.

Tug, email sent.

Cheers,
Rod
11/01/2019 16:38:27

Trying to plan this year's hols. When is the 2019 Forncett Model Enigineers Day?

Cheers,

Rod

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