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Member postings for John MC

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

Thread: Fly wheel size
09/10/2019 08:08:26

My advice here would be to use the flywheel thats available, it may well be OK. If not then try again with the size recommended.

I was once involved in IC engine design, one engine, a diesel of about half a litre swept volume had a flywheel about one tenth of what was recommended, it ran fine, it could idle at 500rpm and, much to everyone's astonishment rev to 7000rpm while still making useful power! 5500rpm was the designed maximum rpm.


Thread: At last - no more chattering when parting off!
07/10/2019 10:04:51

A good reason why videos of this nature should be peer reviewed before put on the 'net! Not going to happen though.

I've done similar occasionally, difference being I made a tool post clamp for the angle grinder. Recently reduced the width of a case hardened gear in a motorcycle gearbox. Also used PPE, something the guy in the video was probably not to bothered about.

And before anyone mentions the evils of grinding dust , I do cover the important bits.


Thread: Hammer/Drift
03/10/2019 10:22:21

Seeing the picture of the hammer/drift brought back many pleasant apprenticeship memories. The one handed operation was useful, and, as Hopper says, it would "lever" out the smaller MT's.

I really wish I "acquired" one all those years ago, too honest I guess!

I'm intrigued by the Chronos offering, I'm going to buy one.


Thread: How many Hammers
27/09/2019 07:44:53

Perhaps this thread should be "balanced" with a "how many micrometers" thread. Both can be used with precision,apparently.


25/09/2019 15:19:05

17 for me of all types, from a medium size sledge down to something so light I don't recall ever using it. Including a ball pein (pane, peen, pien???) hammer I forged myself during my apprenticeship, we spent a few weeks with a proper engineering blacksmith, (not what seems to commonly pass as such these days). I've also just successfully replaced the hide end of my size 1 Thor mallet.


Thread: Electronic water gauge
24/09/2019 08:14:46

Thanks for the replies. I've tried varying the search words, no luck yet.

The Youtube video could be useful.

I've looked on the Maidstone website, couldn't find anything.

Been to the Model Boat Mayhem forum, tried a search but can't get past their anti-spam thing, its a rediculous set up!


Thread: Versatool cabinets
24/09/2019 08:03:23

If I had the space for Versatool cabinets of that style I would have a workshop full!

Reminds me of my time as an apprentice, the milling sections Versatool cabinets were well layed out, each mill had its own complete toolkit, accessories etc. carefully stored. The instructor would check at close of play if everything was back in its place. Anything missing and we would all stay until found. It was a joy to work in that section having all the kit to hand. Excellent instuctor as well.

Unlike the turning section, Versatool cabinets again. Tools, accessories, etc just chucked in anywhere. So frustrating not being able to find a chuck key. We offered to organise the cabinets but were told by the instructor that we were there to learn to turn not to tidy. Hopeless instuctor compared with the rest of the guys that I was lucky enough to work with

Sorry to ramble on!


Thread: Electronic water gauge
23/09/2019 11:51:13

I'm looking for a design for an electrical/electronic water gauge for a gauge 0 loco boiler. The boiler has a conventional glass tube gauge thats difficult to read. What I'm looking for is a "sender" that can be fitted to the boiler with a suitable LED indicating thus, LED on, level OK, LED flickering, top up, LED off, level very low fill quickly.

I sure I have seen such things described, my recent searches haven't fund anything suitable.

Thanks, John

Thread: Black Bar
14/09/2019 18:02:50

My preference is to always go for black bar if it's available in the grade of steel I want to purchase. Two reasons, its usually cheaper than bright drawn, also less prone to distortion during machining.

If steel is sold as EN3, black or cold drawn it will be EN3. All "new" steel will contain recycled steel, steel being one of the most recycled materials.


Thread: Warco WM16 Powerfeed
11/09/2019 11:54:21

I've been looking at this design for a power feed for a mill I'm working on. Two reservation, firstly is that there is no means of instantly disengaging the drive to the table. Secondly, electrical stops, how accurate are they? OK for limiting the overall feed. Does the motor stop instantly or is there a finite period of slowing down?

Neither of these are "show stoppers" for me, I'll sort out a lever operated dog clutch. As for reliable/accurate stops I can work around that one, disengage the drive near to where I want to stop the feed and manually feed up to a point on the dial/DRO.


Thread: How to upset the neighbours!
11/09/2019 11:30:37
Posted by Michael Gilligan on 11/09/2019 08:25:34:
Posted by John MC on 11/09/2019 08:01:34:

[ ... ] It seemed to me that the money ran out just before they got to the rear suspension, that really lets the car down. After the work they did with the front end its a great shame the rear end didn't benefit the same way.



... Something like the Reliant Scimitar's [parallelogram trailing arms, and a Watt's Linkage] would probably have done nicely.

I was thinking of independent suspension, various aftermarket arrangements were (are?) available. I think those suffered from compromises on installation, the back end needed a complete redesign to be able accommodate that type of suspension.

I think the Scimitar is a much under rated "classic", buy one now before people realise how good they are! The suspension, independent front (Triumph based) and a beam rear axle works very well when set up properly.



Edited By Michael Gilligan on 11/09/2019 08:26:10

11/09/2019 08:01:34

Can't say these truck engined B's do much for me, far to heavy up front! The V8 was a much better balanced car that should have been developed much further.

I've always admired the RV8 version of the B, the guys who developed it on a very small budget as much as the car itself. It seemed to me that the money ran out just before they got to the rear suspension, that really lets the car down. After the work they did with the front end its a great shame the rear end didn't benefit the same way.


Thread: Cheapskate Sandblaster
07/09/2019 07:58:16

I have an ancient Guyson grit blast cabinet. When I bought it the seller insisted I take the extraction/filter unit, at no extra cost! "You'll need it mate" he said, how very right he was. Using finer types of grit it soon gets hard to see what I'm doing if the extractor is not running.

I use the cabinet infrequently, never the less I find it surprising just how much the dust the extractor collects, better there than inside me.


Thread: Velocette
16/08/2019 16:32:20
Posted by Graham Williams 11 on 16/08/2019 11:31:37:

What's the consensus on the use of a 0.8mod cutter using 32dp specs i.e. depth of tooth and outside diameter on a magneto drive gear for a Velo MAC, alloy engine, 92 teeth?


Graham W

Sorry to say no good at all, assuming you are forming rather than generating the gear. These gears need hobbing (generating the tooth form), although not transmitting any great load the formed tooth will probably be quite noisy, defeating Veloce's use of helicals to keep thing quiet.

Why not buy a gear (£59 from the VOC) intended for the manual advance/retard and modify that?


Thread: What 3 Words
16/08/2019 07:48:26

Recently I had first hand experience of the app working. Out mountain biking we came across a group of walkers, one of them in very obvious distress. Fortunately they had the app on a phone and luckily the local emergency services had just started using it. The emergency services were able to get to the location quickly. These walkers were not local so, would by their own admission would struggle to give an accurate location. Us MTBers being local may also have struggled using local rather than the "official" names for the area and features that the services need.

Needless to say I've installed the app!


Thread: Chosing a drill grinding attachment or machine
15/08/2019 16:51:17

This drill sharpener was a pleasant surprise! I bought it from Aldi (under a fiver, I think, complete with a spare grinding wheel) several years ago as a means of sharpening drills "off site". It works very well. Power is provided from an electric drill, I used a drill with a top speed of about 3000rpm, not really enough but I suspect running any faster would shorten it's life significantly .

Copes well with both HSS and tipped masonry drills.



10/08/2019 16:45:12

The last two posts, should we ignore or follow the instructions! I (and others) have taken both approaches, still doesn't work. My 20 year old (I think) version of the Drill doctor was notorious for variable results, newer versions seem better. It was the second one I had, first one returned to the supplier, really should have sent second back but never got around to it. Anyone want it, free to a good home......


Edited By John MC on 10/08/2019 16:51:50

10/08/2019 11:52:54

I would recommend one of these,

Not cheap, I shopped around and found the same machine for ~£200 less.

In the past I've used a Draper attachment, looks cheap and nasty but works remarkably well. Also a Martek and a Drill Doctor, both hopeless. Ok for getting an even point but both failed to give any clearance, needed to do that off hand.

There was a recent thread about drill sharpening that encouraged me to have another go with the Drill Doctor, same result, even length cutting edges, no clearance!

Perhaps somebody out there wants it, they might have more luck with it than me.


Thread: What Did You Do Today 2019
09/08/2019 07:53:15
Posted by John Hinkley on 03/08/2019 15:39:52:

Meantime back at the ranch ............

I've done a bit more with the gearbox internals:

Input and output shafts

The reverse gear idler is missing from this shot. I need to find out how to insert a new offset axis in Alibre Atom. And the shaft ends aren't complete, yet, either. But it's progress.


Interesting, what's the gearbox for?

John MC

Thread: Shot peening for metal improvement
05/08/2019 17:55:23

I have used Oselli engines, when they were based in Oxford, to shot peen connecting rods. I was pleased to see they used Almen Strips to gauge the intensity (is that the correct word?) of the peening. Oddly enough, it made the rods very fragile until engine assembly was completed! The slightest mark on the rod completely nullified the advantageous effect, extreme care was needed on assembly.

I have considered using my blasting equipment for shot peening. I occasionally change the blast media from something aggressive to a more gentle media but have been advised by a supplier of peening media that A dedicated cabinet is vital so as to avoid contamination and therefore negating the advantages of shot peening.


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