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Member postings for Ian Parkin

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

Thread: Motorcycle General Discussion
23/08/2019 12:46:16

Yes he was quite rude when i pointed out his rear brake linkage wasnt much good.

This is whats wrong with not having to have a mot for over 40 year old vehicles

people change things with no real idea of the consequences of their actions

17/08/2019 15:04:10

 

Says it tax and mot exempt 

professional job

always passed mot’s

He’s asking 8K for it

Edited By Ian Parkin on 17/08/2019 15:05:58

17/08/2019 11:51:22

Just seen this bike advertised on a local forum

have a look at the rear brake actuating rod..

wouldn’t want to be relying on that in a panic stop

13f8e70f-2958-47a8-a13d-316c04cd3116.jpeg

Thread: Grid Frequency [mains electricity]
14/08/2019 10:19:21

I cant really understand why it needs complex algorithims and a mocked up supermarket and university researhers to realise that if you switch off a fridge/freezer for a matter of minutes then nothing really is going to happen to your stored food.

the original more indepth article in the paper rather than the online one i linked to suggested that the fridges were generating power to pump back in rather than just reducing demand

if just tesco are using 50 MW just imagine what the total load is over all of GB for all fridges and freezers industrial commercial and domestic

13/08/2019 14:35:56

Oldmart

reversing the mains input will do nothing to a synchronous motor’s direction but taking it to bits and reversing components will for your old bosses clock

Bazyle

in the guardian on monday was an article about Tesco’s being able to use their fridges to pump back in to the network to the tune of 50MW ..i’m Not sure what they mean by this perhaps they have big back up UPS’S to keep their fridges going in the event of a power cut

https://www.theguardian.com/business/2019/jun/23/cool-running-supermarket-fridges-could-help-power-uk

Edited By Ian Parkin on 13/08/2019 14:37:24

13/08/2019 07:31:10

From the frequency website that micheal linked to I,d not heard of copper clad aluminium before I,d heard of alloy clad steel...

  • A significantly higher frequency, e.g 400Hz as used in aircraft, would cause skin effects in transmission lines and this would reduce their carrying capacity or result in unwanted heating. At 50Hz, the electricity only travels through the outer 9.2mm of a copper conductor, so anything larger than 18.4mm in diameter is a waste of material unless it is for mechanical strength. To reduce weight and cost, many large conductors are made from copper-clad aluminium so that the electricity flows through the higher conductivity copper skin while the aluminium core provides the mechanical support.
Thread: Harrison M300 or M250 pulley/belts problem
09/08/2019 11:53:27

If the cap head bolt is your only problem then whip it out replace belt refit job done

Thread: WM18 - Z Axis power feed
23/07/2019 16:45:24

The one i linked is 40rpm but also 7rpm???

i seem to remember mine is 50 rpm (i’m Not able to check until Friday)

suppose it depends how fast you want but i flick the switch and rarely have to wait long till the heads where i need

23/07/2019 16:08:41

This one would do nicely

**LINK**

and has a right angled drive saving you buying gears

23/07/2019 14:35:07

dsc00854 (large).jpg

That’s a parvalux geared 24v motor easily available off ebay and with this motor you would have to put a clutch in as you wont be easily overrunning it if you want a manual handle too..why you want a handle?

Edited By Ian Parkin on 23/07/2019 14:36:36

Edited By Ian Parkin on 23/07/2019 14:37:14

Thread: Universal T milling machine from Chester : Issue with Starting
10/07/2019 09:22:05

Those diagrams dont seem to be of your machine

theres no VFD for a start

Is yours single phase or 3 phase?

09/07/2019 16:48:55

Turn off all the QF switches 1-6 and turn them back on

sometimes these trip without showing

after then we need a diagram

Thread: Genmitsu
08/07/2019 15:14:04

I would say not

its as cheap as a cnc can get and still work

theres no software with it...mach 3 is £120 ish or the free mentioned

the motor will drive you mad with the lack of power and noise

soft wood ,foam but no metals at all not too sure about acyrilics

and it has a very small work envelope

Thread: What are these wheels /tyres?
19/06/2019 11:22:45

Thanks Jason

i had searched for “all terrain vehicle” to no avail

”atv “ brings up loads !!!!!

19/06/2019 11:02:26

Can anyone recognise these wheels tyres? And any idea where i can get a pair?d953791b-b83a-4c21-b9c9-7f37b3d8d64f.jpeg

Thread: Chinese speed controller
12/06/2019 12:02:13

where are you Rob?

I can do you a small 3 phase motor and vfd cheaply if you want

and a 3phase and vfd is only 240v so no more hurty than what you have now

Thread: Worx 20V drill issue
12/06/2019 10:39:35

The coming to an abrupt stop is the brake circuitry working perhaps?

Thread: mark 1 1/2 student with an inverter
11/06/2019 12:56:19

So mount your inverter VFD and wire in the 3 wires out to your motor after charging the motor terminals to delta from star...

its best to supply the power to the vfd via an isolater

you can use your original handle switch and the reverse switch easily it don’t make any difference low or high voltage

your start switch just wants a normally open pair

your reverse wants a common to a NC one way and to a NO for reverse so whichever way your reverse switch is it sends a supply to the vfd to start in the relevant direction

You do need to be able to use a meter on continuity to work out the switches

you may also have a switch to the key on the cupboard and one on the gear guard

 

POST pictures of what you have if you are unsure

Edited By Ian Parkin on 11/06/2019 12:56:55

Edited By Ian Parkin on 11/06/2019 13:24:42

05/06/2019 15:59:23

Short answer NO

You need to wire directly to the motor from the VFD

then use the switches to control the VFD

Exactly the machine i have with VFD but i have a clutch too

Ian

Thread: A kitchen table workshop. Tool grinding problems
29/05/2019 14:06:18

Steve I was going to post you this gratis if you think you may use it

8aa1ae68-1617-4e6c-89ed-ed8e36b1c5f6.jpeg

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