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Member postings for Stewart Hart

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

Thread: Locked out of computer
15/02/2020 09:36:58
Posted by Robert Atkinson 2 on 15/02/2020 09:06:07:

What computer? What operting system?

Desktop / Laptop /All in one?

PC / Mac / Linux

Make and Model

OS version?

With this information we can give you some checks to do.

Robert G8RPIIt’s a Asus PC had it for more than 5 years Windows OS by the sounds of it it’s gone to the big shop in the sky

15/02/2020 08:40:17

I was looking something up on the banggood site this morning when the screen went blank and briefly flashed locking and everything went dead and I Just can’t switch back on 😭any ideas about what has happened have I caught a virus I have Norton protection


Thread: High Speed Drilling Attachment by pottyengineering
01/02/2020 12:45:14

Hi George

I've been puzzling about that also I did this check on alignment


And everything looked good, so I'm wondering if I got the drill slightly of centre in the chuck with those small drill its easy to grip it with just two jaws I was also wondering if centrifugal force was whipping the point out, though that doesn't seem to happen when I had it in the mill. It didn't seem to effect it much though.

Thanks for your interest


31/01/2020 18:37:04
Ok as promised the video of the high speed drilling attachment in action

Edited By Stewart Hart on 31/01/2020 18:38:48

30/01/2020 08:23:00
Posted by Stewart Hart on 29/01/2020 19:58:35:
Posted by Steve Crow on 29/01/2020 19:24:37:

Very nice! Could you tell me what is the diameter of the motor?



its just over 40mm. There are two sizes of motor available both with chucks the smaller one has a 3mm spindle I bought one of these first but I wasn’t happy with it the spindle to flimsy so I used the bigger one 5mm spindle which is a lot more ridged.


This is the electric motor I used **LINK**


30/01/2020 07:41:28
Posted by Simon Collier on 29/01/2020 22:00:15

Recently I was searching around for your injector making stuff, but I could not find the whole story in one place and you seem not to have a web site.

Hi Simon

I've posted on her a couple of times with my injectors builds **LINK**

And this is how I make high speed D bits

I'll send you a PM with my email so we can discuss injectors one to one.




Edited By Stewart Hart on 30/01/2020 08:18:10

29/01/2020 19:58:35
Posted by Steve Crow on 29/01/2020 19:24:37:

Very nice! Could you tell me what is the diameter of the motor?



its just over 40mm. There are two sizes of motor available both with chucks the smaller one has a 3mm spindle I bought one of these first but I wasn’t happy with it the spindle to flimsy so I used the bigger one 5mm spindle which is a lot more ridged.


29/01/2020 15:19:13

From time to time I delve into the black art of making injectors, I've been quite successful in making the 24oz size but struggled with the smaller sizes mainly due to the difficulty with drilling the small holes, my lathe just hasn't got the speed. What I need is a high speed drilling attachment, I've been pondering this problem for some time had a couple of ideas that I've rejected:- finally I came up with this:-


What the hells that I can hear you saying well it started life as this.


A 24V high speed motor with chuck that I found on the internet (5mm output shaft) a M3 morse taper threaded 1/2" UNF and a 2 1/4" dia chunk of ally.

Cut a slice of ally off and machine up the end cap,



Now its important that everything lines up with the centre of the lathe. The motor is screwed to the end cap, so the end cap must run true with the motor shaft.

Make a temporary female centre.


Grip one end of the shaft in a chuck that you know runs true and suport the other end with the feamle centre and skim up the register dia and face of the end cap.


Clock the body up true and drill bore and tap to take the M3 morse taper abour.


Don't fix it in permanent yet

Flip it round clock it up again and rough out the bore.


Drill a few holes for cooling and wiring.

Now fix it to the Morse arbour, my lathe is M3 in the head stock so mount the assy in the head stock, and face and finish the bore to give a nice fit to the cap.


Check that everything lines up.


Proof of the pudding.



It took me just over two days to make it it seems to work OK I'll post a video over the weekend of it working


Edited By Stewart Hart on 29/01/2020 15:22:27

Thread: Tuna Can Blower
23/01/2020 08:11:47

Just to add a bit more interest to the thread, when drilling thin sheet with a normal drill you can run into trouble with a ragged hole or even worse.

I was shown this little trick when I was an apprentice, grind a drill up with a little teat and a slightly undercut flat, this way the teat acts as a pilot and the under cut means that only the edge of the drill cuts, it cuts out a washer out and you end up with a nice clean hole.




23/01/2020 08:05:14
Posted by Bryan Cedar 1 on 22/01/2020 18:02:44:

Looks like you are into making metal underpants at the same time, see photo number 4 !

I had the same thought Bryan it does look like a pair of Y fronts smiley

Thanks for your interest gents and comments smileysadlaughlaugh

Lets see some veggie based blowers


22/01/2020 13:49:57

Why do they call steam raising blowers when they suck ?. laugh

On with the mater in hand, I've tired various blowers and I found the best to be the ones made from 24V ex-military radio cooling vans you could get these quite cheep at one time but with scarcity they are getting expensive. And as is my natural curiosity I've stripped a fair number of blowers down. Then when making myself a lunchtime Tuna sandwich I looked at the empty tin and had the idea of making a blower out of it, I took the empty tin with us when we next went to the supper market looking for a suitable tin to make the inner fan out of to me delight I found that the smaller tins of Tuna they sell would just fit the bill. 24V electric motors are easy to obtain of the net.

A few manufacturing shot




Drilling the base of the fan the vanes were put in with a wood chisel whilst the inside was supported by a lump of wood.


The gap for the exhoust vent


The exhaust with its paper pattern


Soldering the exhaust


Machining the top and bottom plates these were made from 100mm dia ally blanks bought of the net.


Completed blower

And yes it does work I recon at that size it would be fine for smaller 5" gauge and 3 1/2, 2 1/2 locos

If you need a bigger blower you'd just have to find some bigger cans.



Edited By Stewart Hart on 22/01/2020 13:54:23

Thread: Stewart Hart
05/01/2020 11:39:27

Hi artful

Thanks for your interest in my helping dad mill engine there have been a lot built I hope you enjoy the build if you need the drawings just send me a pm with your email address


Thread: 2-6-0 Horwich Crab
23/12/2019 07:49:46

Well I guess its time for a progress update:- I've spent the last 12 months building the tender its now more or less complete just a little bit of tidying up required.




I'll crack on with finishing off the loco next year.


Thread: Beginners models
11/12/2019 18:30:14
Posted by SillyOldDuffer on 08/12/2019 09:39:55:

I always recommend Stewart Hart's Potty Mill engine : no castings, simple, but challenging enough to make you think!

Stewart is active on the forum and his engine is discussed in a number of threads, for example this one.

Plans available without bother: I used this found on the web without finding any mistakes. As technical drawings go it's rather cramped, and I believe Stewart provides better laid out drawings?

Possible negative for some, it's a metric design.

As a training exercise, I built one in Fusion 360, this image being when I was struggling to learn moving joints!

assembly v27.jpg


Edited By SillyOldDuffer on 08/12/2019 09:44:49

Thanks for your endorsement Dave. If anyone wants a set of drawings just send me a PM with your email address


Thread: Clutch type lubricator
11/12/2019 12:05:19

Thanks for the tip John I have two on order


09/12/2019 09:51:26

Thanks Brian I forgot about them they do good stuff so two ordered via number one son as Christmas/birthday presents


09/12/2019 08:37:14

Hi can anyone point me to a supplier of clutch type lubricators, I've tried all the usual suppliers:; Blackgates, MaccModels, Polly and they only do the ratchet type although they will supply the clutches to fit in your own lubricators, but I want to short cut the process and by a finished lubricator.


Thread: Potty:- Helping Dad Grasshopper Engine
29/11/2019 17:43:18

Hi Jim

Thanks for your interest in my grasshopper engine design unfortunately despite encouraging noises from editing team I don’t think it will be published in the near future you could try giving the Ed a gentle push


10/11/2019 08:16:08

Yes I made a 100mm one this makes the calculation easy my version is different in that it has a swivel base, this also makes it easy to set up. I submitted an article to ME workshop but as yet its not been published if any one would like a set of drawings just PM me.





Thread: South Cheshire Model Engineering Society Annual Gala
05/09/2019 09:31:09

I’ll ask tomorrow Dek if it’s ok I can give you a lift


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