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Member postings for John Haine

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

Thread: Cowells Milling/ Z axis design
17/05/2022 08:45:05

Steve, the clue is in the name, thrust bearing. What direction do the forces act when you operate the screw?

Thread: Tyres
13/05/2022 11:21:23
Posted by Circlip on 13/05/2022 10:36:46:

My 'cheap' Romanian Renault has a light on the dash telling me to 'Check tyre pressure' . Don't know how it can sense this, standard wheel nuts so there must be an inertial gravitational balance system built into the dashboard???? Yet another waste of electronic gizmo programming on modern cars.

Regards Ian.

They compare rotational speed between tyres on the same axle as measured by the antilock brake sensors. A/k/a wheel ticks. Since the sensors are there anyway it's just software.

Thread: 3 phase query - for a charity project in Africa
13/05/2022 11:10:53

I assume that being Africa it's usually rather hot? Solar gain and chimneys would seem to be the obvious solution.

Google solar dehydrator.

Edited By John Haine on 13/05/2022 11:12:47

Edited By John Haine on 13/05/2022 11:13:54

Thread: Re-boring Grind Wheels
13/05/2022 07:35:19

I suspect that the risks of damaging the wheel integrity and weakening it are too high to even attempt it, to be frank. I don't think they are that expensive, I'd suggest just buying some good quality replacements with bushes if necessary.

Thread: Barograph 'stiction'
12/05/2022 13:51:58

I think you mean "balance wheels" (sorry, inner pedant at work!). It might help just to dismantle, clean and oil the bearings.

Thread: Anyone know what these are called?
11/05/2022 19:14:31

He learned a bit from Roger Penrose.

11/05/2022 19:14:10

He learned a bit fro Roger Penrose.

Thread: Gallium
08/05/2022 17:50:28

Gallium Arsenide, an allow of Ga and As, is a III-V semiconductor and widely used in microwave and electro-optic devices. Your mobile phone probably has some in it. Gallium Nitride also a key material in microwave devices and increasingly in power devices for applications such as EVs. A most important element.

Thread: Thread gears for Warco GH-1322 lathe.
05/05/2022 15:39:41

Electronic leadscrew?

Thread: help wiring a 3 ph coolant motor
05/05/2022 12:01:17

If you have a winding backwards relative to the other two the motor will not run properly. Call the ends of the windings on the star point n1 for the nth winding and the other n2. Then wire 12 to 21, 22 to 31, 32 to 11. If the motor runs backwards reverse two of the mains connections.

Thread: Hobby Cnc
04/05/2022 21:55:20
Posted by James Mitchell 3 on 04/05/2022 19:23:41:

Everything up to and including took steels, travel wise I’m not too worried most of the stuff I’ll be playing with will be quite small, let’s say 5” x 8” would be fine

so I hint rigidity and torque will be my main considerations!

What do you mean by "tool steels" - HSS or carbon steels?

Certainly rigidity is important, but remember that CNC takes away the grunt of winding handles, so running small cutters fast and taking lighter cuts (as long as it is still cutting) means that torque is not so critical as power. Though the Novamill couldn't handle 5x8inch I find that I hardly ever use a vice but other holding methods to minimise the space lost to clamps.

04/05/2022 10:59:08

Ha! Well it's just gone!

04/05/2022 10:07:44

Apologies, wrong link.


It looks like it is the same mechanical package as the Novamill, which I have and it's excellent.

Thread: Emergency Radio Format
04/05/2022 09:12:00

200 kph underwater eh?

Thread: Hobby Cnc
04/05/2022 09:04:57

Look at for details.

04/05/2022 09:04:21

There's a Denford Starmill on eBay right now. Looks like it needs a cleanup and probably new electronics but could be an excellent little machine.

Thread: Screw Jack Casting
03/05/2022 15:48:58

Don't hold your breath waiting for CES, I think they've stopped doing castings completely.

Depending on the height you want, a great alternative is to buy some long series "connector" nuts and have a range of hex-head bolt lengths to get different heights. An M10 long nut is 30mm long, M12 36mm. Very lightly skim one end to get rid of any burr, and face off the top of the bolts.

Thread: Emergency Radio Format
03/05/2022 14:26:11

Except now it will be digital! The US has had this emergency alerting via mobile for quite a while.

Thread: Cj18a mini lathe
02/05/2022 07:14:39

The speed controllers in these lathes are a disgrace, they seem to give endless trouble. Best thing to do is fit an alternative industrial dc motor controller such as a Sprint or KBE one IMHO. People do spends a lot of time troubleshooting them but it's polishing the proverbial.

Thread: Looking for a non-magnetic, strong, easily glued material
30/04/2022 10:03:24

I have now run some tests on magnetic prototyping software and it seems that the key metric is (magnetic) Relative Permeability and it turns out that "non-magnetic" stainless steel (e.g. 316L), 1050 Aluminium and Nylon all have a magnetic Relative Permeability of very close 1. .....

Well, who'd a - thunkit! Frankly you don't need "magnetic prototyping software" for that, it was obvious at the beginning. See Wikipedia - could have saved 3 pages of threads and given you your answer in minutes.

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