By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for John Baron

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

Thread: Single phase induction motor speed control
27/01/2018 14:52:13

One way of controlling the motor speed is to vary the frequency of the supply voltage. This can be done by rectifying the mains to turn it into DC, and then chopping up the DC to provide pulses at a high frequency. Say 20 KHz. By modulating the pulses at 50 Hz plus or minus a few cycles will allow the motor speed to be changed up or down.

Thread: Hello from Lazarus
21/12/2017 20:17:20

Hi John,

I know someone suggested "Zeus" tables ! But could I suggest the "Presto Counsellor" its a free download on the "Presto Tools" web site.    Just click on "Counsellor

If you ring them, their phone number is at the bottom of that page, and ask, they will send you a paper copy. Actually it is a very handy 1/2 A5 book.


Edited By John Baron on 21/12/2017 20:18:52

Edited By John Baron on 21/12/2017 20:19:50

Thread: Good Milling Guide & Deckel FP1
01/11/2017 21:56:51

Hello Mark,

Thank you for those two pages.

I forgot to mention in my other post, your FP1 refurb looks superb. I'm quite envious.



01/11/2017 19:43:06

Hello Mark,

Thank you for your upload of the FP1 manual, it's much appreciated.

There is however some pages missing ! I've ignored duplicated ones.

The missing pages are:- in bb, 26 & 27 and in cc, 42, 43, 44, & 45.

Many thanks:


Thread: Centre drilling long length, small diameter bar
06/08/2017 21:19:56

Hi David,

For doing the sort of thing that you want to do, I use a length of plastic water pipe over the end hanging out. Two G clamps, a length of wood and a stool.


Edited By John Baron on 06/08/2017 21:20:30 "Spelling"

Edited By John Baron on 06/08/2017 21:21:52

Thread: What are these stone sticks?
06/08/2017 21:13:03

Hi Richard,

It is chalk ! Actually its called "French Chalk" and it is usually used for writing on steelwork, often powered and used when mending punctures in your bike tyres tube, to stop the glue sticking to the inside of the tyre.



Edited By John Baron on 06/08/2017 21:14:46

Thread: Corrosive liquids. ...................................
14/07/2017 19:47:18

Hi Guys,

Of the three acids mentioned here, hydrofluoric acid is probably the most dangerous ! Because it is an "oily" acid, once on the skin it is extremely difficult to remove and severe damage done from only a few drops. The other two acids can be rapidly dissipated with copious amounts of water.

Thread: 4 facet drill sharpening jig plans
18/02/2017 16:39:20

Hi Dave,

Drop John Moran an Email, he is very helpful. I've built the 4-6 facet drill sharpener and I'm very happy with it. I also made a jig to sharpen slot drils and end mills.

It is a bit fiddly to set up, but once you have got your head around it, it becomes very obvious.

I've just looked on the Gadget Builder web site and discovered that my grinder is pictured there, near the bottom of the page.


Edited By John Baron on 18/02/2017 16:58:41

Thread: Countersinking problems
25/01/2017 20:17:44

Try "Weldon" single hole countersinks. I have a set that goes from 1mm to 25 mm. For holes 5 mm you need a 3 to 6 mm one. That is one of the double ended ones.

Thread: What AMP power supply for windscreen wiper motor
07/01/2017 20:30:13

I built a window screen wiper motor table drive quite some time ago. I got mine from the local scrapyard for the cost of taking it off the scrap car it was attached to. Actually I got two, one left hand drive and one right hand drive. Neither draw more than 2.5 amps at 12 volts on full load. Mine normally takes about 2 amps and runs at around 8 volts. I actually run it from an old variable voltage lab PSU, which has built in voltage and current meters. I used a tumbler gear mechanism to provide both reversing and disconnection so that the right handwheel can be manually turned.

For a build log.

Edited By John Baron on 07/01/2017 20:36:16

Edited By John Baron on 07/01/2017 20:36:42

Thread: Leveling and fixing a Myford lathe
23/08/2016 17:24:20

Hi, the stud shown in the lower photo has been screwed too far down into the block under the foot. Slacken the nut underneath and screw it out until it is about two nut thicknesses above the foot. Tighten the nut and adjust the foot support nut as needed. Make adjustments to level the lathe as per the manual.

Thread: Chamfer Milling
20/08/2016 22:00:40

Hi David,

Depending on how big you want to make the chamfer, I use woodwork router cutters. A 45 degree cutter should work nicely.

Thread: Unusual thread? well it is to me!!
07/07/2016 21:16:38

Hi Codger,

5/8" X 24 tpi is the thread on PL259 and SO259 RF plugs and sockets, commonly found on CB radios and the like.

Thread: Wife's domestic iron
01/04/2016 17:53:39

Hi Bob,

Somewhere kicking about I have a box containing around a thousand black neoprene cable relief sleeves. They are/were intended to fit into Bulgin kettle plugs.

If you want one or more PM me.

Thread: WARCO WM-250 lathe family and WM16 mill
12/02/2016 21:30:10

Same with the Mill. I have a mill similar and two people lifted it easily onto the stand. WFWiW I didn't bother bolting the stand down. It is stood on a patch of old conveyer belt.

Thread: Cheap stepper motor couplings?
12/02/2016 21:21:02

Michael I agree ! This is where "Oldham" couplings score. They can tolerate quite a large axial displacement but are very limited with angular alignment.

I've actually seen rubber tube couplings get so hot that the rubber melts and fails.

12/02/2016 20:21:12

Forgot to add thanks Michael W & Neil for album instructions. Though I can't see me wanting to add any more pictures. Sorry.

12/02/2016 20:18:08

Hi Guys,


This is what I meant. I hope that it makes sense now.


What a horrible procedure just to insert a picture.

12/02/2016 17:47:43

Hi Geoff,

I don't think that I was very clear in my post when I said

[quote] won't allow for any offset between shafts not in line. [/quote]

That type of coupling copes well for shafts that are at a small angle to each other, the shafts still have to be co-axial, ie on the same centers at the ends.

NOTE: How do you put pictures into posts ?


Edited By John Baron on 12/02/2016 17:48:11

Thread: Spare part wanted
11/02/2016 21:57:14

Hi Clive,

3D printing would be a good candidate for these brush holders if a suitable high temperature melting point plastic can be used.

One of the reasons that I used PTFE is that it can withstand 200 degrees and I happened to have some used seals from acid control valves that I cut down. The center hole was drilled out and then a silver steel broach made to cut the rectangular profile. At a pinch the original brass guide could be pressed into a suitable size hole in the PTFE.

Forgot to add, PTFE is very slippery as is the carbon brush, it also needs very sharp tools when cutting it.


Edited By John Baron on 11/02/2016 22:04:40

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
JD Metals
walker midge
rapid Direct
Eccentric July 5 2018
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest