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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: Cast iron - 160mm dia
05/07/2019 07:37:52

Seems that from the above posts cast iron is the preferred material for chuck back plates, why is that?

Thread: Satnav
25/06/2019 07:59:12

Clive F. I do hope you are joking! I suppose competing in a 3 wheeler with a co-pilot is cheating, Sitting behind a fairing could be considered the same, riding a diesel engined bike that did not need a refuel for the (540miles) duration of the rally is unfair! An ubundance of power is an unfair advantage! A real rider would achieve the top award on a Honda 50!

The rally now runs from 12.00 untill 10.00am the next day, 2 hours longer than a few years ago! And only 540 miles maximum, in the good old days it was 700 miles in 2 hours less.

My favoured method of route finding was a map in a tank bag. The thing is scooters don't have anywhere to put a tank bag so its a satnav for me. But, I'll only be listening to it so I'm only half cheating!

John (with tongue firmly in cheek).

24/06/2019 15:10:32

Thanks all for the replies. The device (Tomtom) is quite old so no Bluetooth. I've cleared out some memory on the phone and downloaded Waze. Pleasantly surprised with how well it works! The reason I want satnav on the bike is because I have entered this years ACU National Rally for the first time in a few years. When I was a regular competitor I could remember where the location of the controls, mostly. I'm staying local (ish), trouble is some controls have gone and been replaced with controls in different places, I'm hoping the satnav will help ne find them.

As for buying a motorcycle specific device, they seem to be quite expensive, especially for something that will get very occaional use. The last to new cars I bought have built in satnav. The old Tomtom still gets used in my classic car.


23/06/2019 08:14:53

Nothing to do with model engineering and I apologise for that but with the depth of knowledge around here I might get an answer!

I have a Tomtom car satnav that I want to use on a motorcycle and will need to mostly hear rather than see the instructions. Problem is there is no headphone socket, only the USB connection for charging and upgrading.

Is there some way I can get the voice commands in to an earpiece?

I suppose the alternative would be to use my smart phone, problem there is that it doesn't have much memory......

Thanks in anticipation of some wondrous solution!


Thread: What is this?
09/06/2019 08:02:51
Posted by Sean Cullen on 08/06/2019 20:35:17:
Posted by 34046 on 08/06/2019 19:39:25:

John, that is an interesting version - never seen one with the extension on the top cover before .

Looks good.


I wondered about that. I don't have the end covers so will have to turn from bar. Does the piston for fit up there? A photo of the other side would help if you can


I've no idea if the piston rod is guided by the extension on the cover! It may have been the "chucking boss" on the casting that I decided to machine in that way.


08/06/2019 11:37:41

This is my attempt at the Reeves popular engine. I acquired two sets of castings some 30+ years ago from the estate of a deceased model engineer. This is one of them, the other is in a small steam launch.


Thread: Binding on axis when locking off other
05/06/2019 07:47:09

Could be distortion of the worktable? I have seen, on these lightly constructed machines, work clamped to the table causing the movement to become somewhat stiffer due to distortion.

What to do about it I don't know.


Thread: Motorcycle 'blipping'...
04/06/2019 07:48:02

The new Amal carburettors made by Burlen's are made from decent material and the slides are anodised/plated. Something Amal should have done!

It should be remembered that Amal had to give their customers (the motorcycle manufactures) what they wanted. When BSA wanted carburettor costs reduced Amal needed to react. What we got was the "concentric" replacing the "monobloc". A inferior device but much cheaper to manufacture.

As for "blipping" the throttle, worn carb., incorrectly set, poor maintenance, habit, macho?


Thread: Myford/ Drummond M Type chuck back plate.
03/06/2019 10:23:03

Two slots positioned at 180 degrees would be better for balance? I suppose it depends on what sort of (high) speeds the lathe is run at.

Good advice not to lock the spindle with the back gear, there is often a cast iron gear in the train to quite things down.

How about some ideas about locking the spindle without straining some part of the drive train.


Thread: The Chocolate Fireguard as designed by Mercedes Benz
11/05/2019 11:32:42

Just read a newspaper article regarding the ranges achievable with ICE cars, seems 800 - 1000+ miles is becoming easily attainable. EV's have a long way to go to get anywhere near that. Isn't going to help getting the motoring masses to accept EV's.

Thread: Honing motor cycle small ends
11/05/2019 08:18:24
Posted by sparky mike on 10/05/2019 08:36:20:

The reamer will not produce a good enough finish and chance of getting it off square to the cylinder barrel.


Totally agree. The small ends really need to be bored parallel to the big ends. While a good (sharp) reamer will produce a size/plus hole with good repeatability it may not be the right size for the pin or a good enough finish. My preferred method is to bore a small end bush to within a couple of thou and then on to the (Delapena) hone to finish.

Velocette made some of their small ends neither metric or imperial in diameter to discourage the use of a reamer to finish the bore of the bush. Problem was that it was easy enough to get a reamer ground to the size required......

I good attempt to encourage getting the job done properly.


Thread: Sump Plug
02/05/2019 11:49:21

This is one of those jobs that really needs to be done properly. That is to say most likely a sump off job. What engine is it?

I too have seen what "sump suckers" leave behind. Nothing beats a sump plug in the right place with a magnet in the plug and a hot engine for a proper drain.


Thread: 1959 Nsu quickly
30/04/2019 19:33:19

Wouldn't have raised an eyebrow if posted in the "Vehicle Restoration" or "Related Hobbies" sections. Dave, post a photo so some of us can reminicse. I would love to own a Supermax.


(Have I spelt "reminicse" correctly?)

Thread: Gender neutral ships.
25/04/2019 10:32:25

I fear not. Surely there are more important things to get concerned about. We seem to be living in an easily offended society now.


Thread: Rulers - my pet peeve
07/04/2019 08:32:53

My "pet peeve" with rules are rounded ends, happens when they are carried around in a pocket. Not sure what it is about it that peeves me but it does.img_20190407_082206469.jpg

This rule I find very useful around machinery, particularly the lathe. Wish I could find a metric version.



Thread: What makes your bristle?
06/04/2019 12:20:30

My dentist tells me that a good electric toothbrush will not damage the gum, it actually does them some good, toughens them up and makes them lees liable to infection apparently.

Thread: Knurling speed
03/04/2019 13:16:24

So, as I always thought no need to calculate, did the late GHT write an article about knurling?

Next point for discussion, should the face of the knurl be parallel to the work or at an angle, either leading or trailing?


03/04/2019 07:53:06

I was going to start this post suggesting that knurling doesn't produce swarf, coolant would help the metal "move" under the influence of the knurls. In reality I find that debris is created and needs washing away.

Could this be due to not bothering to calculate the diameter of the work piece to suit the pitch of the knurl?

I've never bothered to calculate the diameter and always get an entirely satisfactory knurl.....

As for speed, on a small lathe I would reduce speed quite a lot to make sure there is sufficient torque, the forces in knurling seem quite high.

I have a larger lathe, plenty of power, I always reduce the speed to knurl because it seems kinder to the knurls.


Thread: Dishwasher detergents
01/04/2019 07:53:00

I once ran out of hand cleaner. Needing to wash my hands after fixing something oily on the car I thought a splash of dish washer fluid would do the trick. Soon found out that was a mistake......


Thread: Scrollsaw for the occasional user
11/03/2019 11:04:38

I bought a Ferm scroll saw from Screwfix 15 years ago, cost about £40 , for occasional use. I've been delighted with it. For me occasional use has been a few time a year, cutting various woods for casting patterns, name plates mainly. Tilting table, essential for pattern making, single speed. The only failure was the squash ball thing that was supposed to blow the sawdust out of the way, the rubber failed, old age? A small brush works just as well. Ferm seemed to be Screwfix's low cost brand at that time, based on my experience with Screwfix in general I think I would try one from there current low cost range again.


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