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Member postings for petro1head

Here is a list of all the postings petro1head has made in our forums. Click on a thread name to jump to the thread.

Thread: WM18 or VMC
01/03/2020 14:31:57

Interesting comment, I suppose I could use 2 mills

i have recommended mine but he likes the look of the VMC so I said I would ask on here for unbiased oppinions.

01/03/2020 11:43:17

Sizes of part not massive. I think he more interested in strength, studyness and ability to cut reasonable size cuts

01/03/2020 07:38:40

Not for me, honest guv, but a pal of mine whoi is looking to buy a mill

He will mainly use it for making parts for a kit car he is bulding

Thread: WM18 - Broken it again :(
24/02/2020 12:27:12
Posted by oldvelo on 23/02/2020 17:49:51:

Just an Idea Plywood 10 mm thick say 120 mm x 120 mm bore a hole in the centre to fit over the motor bolt to the underside of the fan.

That sound like a cunning plan to me

23/02/2020 15:24:00
Posted by mgnbuk on 23/02/2020 15:12:01:

Could you introduce an internal baffle part way down your cover that would reduce the air blowing around the outside of the motor casing & force more of the airflow through it instead ?

Nigel B.

Well I suppose I could use a piece are cardboard

23/02/2020 11:32:17
Posted by mgnbuk on 23/02/2020 10:54:21:

On your machine the airflow needs to be through the motor, not over the casing - the heat is generated in the armature windings & they are what fails. I would look to removing the internal armature "fan" altogether to reduce resistance to airflow though the motor & duct the external fan airflow into the non-drive end near the brushgear. to maximise air through flow.

Nigel B.

So are you suggesting blowing down as opposed to sucking up

Re the fan I may invest in a better fan, the one I have runds at 1200rpm and 70cfm.  Noctua do one thats for industrial use ie servers, that runs at 3000rpm and 110cfm

Re ducting the gap between the top of the motor and the fan is 4mm so think ducting would prob not held and be a bugger to design

Edited By petro1head on 23/02/2020 11:35:07

23/02/2020 09:00:30
Posted by clogs on 23/02/2020 06:09:51:

I nearly bought a WM mill......

after reading this and other problems with the brand.......RATHER glad I didn't.....

with all the world sales I would have thought that the factory should have got it right by now.......

Overpriced and over comes to mind.......

I would not be so quick to dismiss the wm18. It’s a fab mill and any problems I have had have been down to my own fault not the product

22/02/2020 20:57:22

Tbh I suspect the fan is probably only a few mm from the top of the motor but will check

22/02/2020 20:29:00

Can't say I have ever run in reverse but a valid point.

So this is what I have done, 120mm Corsair 12v Fan (140 was just a tad too big) exhausting out at the top of the encloure and several 10mm holes at the bottom

motor enc fan mod 1.jpg

motor enc fan mod 2.jpg

I remembered I already have a 12v supply going to the Angle Eye LED around the quill so can tap into that. Jobs done

Edited By petro1head on 22/02/2020 20:31:11

22/02/2020 19:10:42

Had a look at the current setup.

Using a jos stick to see the flow of air, the fan is at the top of the motor and draws air from the bottom of the motor and exhausts out the top of the motor. However what is very telling is until the motor is spinning at about 900 there is little to no air being drawn in.

So basicall the motor is starved of air at low speed, just as you said. So I am going to route out a 120/140 dia 12v computer fan and mount that iside the cover with a suitable hole cut and suck air out. I am also going at add some holes at the bottom of the cover so more air can get in.

All I need to buy is a 12v supply for the fan

Edited By petro1head on 22/02/2020 19:11:12

Thread: What bench drill
22/02/2020 18:43:24
Posted by Neil Wyatt on 07/02/2020 17:36:01:

Try one of these, I don't think any of those criticisms apply to mine.

Or what about this one Machine Mart Pillar Drill

Thread: WM18 - Broken it again :(
22/02/2020 17:54:31
Posted by oldvelo on 21/02/2020 18:04:11:

So many explanations of what went wrong and why it happened at what needs to be done to fix it.

Prevention is better than cure. Fit a an AMP meter to the DC motor leads in a position where you can see it easily..

Fit auxiliary cooling fan to the motor

amp meter.jpg

Mark the Meter With Maximum Rated Amps of the motor.

Adjust the speed and feed to below the marked amps.

A KB Electronics AC to DC controller set up correctly with the "Locked Rotor Test" to Less than the rated motor AMPS will trip on excessive loading.

Either one will will help I prefer both "Belt and Braces" man myself

Edited By oldvelo on 21/02/2020 18:05:12

One of the problems with the WM18 is the motor is emclosed in a fibre glass case with little ventilation. When I stipped the old motor down it was obvious it had overheated several times so some sot of aux fan would help. Have a few large computer fans lying around that I could use. Note sure where I would fit it ie above the motor and would it suck out heat or blow in cold air?

However I also understand that because I have fans does not mean I can, again, try to make the mill do what it was never inteneded to do.

22/02/2020 17:49:57

I just saw the first page when I posted my reply but oh boy 3 pages

Skimming thro I would agree that it was my fault, impatient git that I am and the learn the hard/expensive way.

22/02/2020 17:39:32

Bugger, for some reason I have never recd email notification of replies to this. Poss because I forgot to check the box.

So appologies for not replying.

Yes an expensive lesson thats now fix. It was the motor and I suspect I had cooked it when I had a jam a couple of months ago and beoke the sacraficial cog between the motor and spindle and then the drilling opperation was the final straw. Warco had stock and got it next day. Cost £270!!!

Now I see that Ian was offering his grrrrrrrrrrrrrrr My loss

My pal also suggested I 3 phase it but that was after I had bought the motor

So Ian, in case there is a next time what motor did you use for the 3 phase conversion and was it a straight saw or did it need some fettling?

Email noitification box ticked

Thread: Subscribing to Model Engineers Workshop
22/02/2020 17:22:20

Resurecting this as I am not sure if my subscription has expired?

Thread: Carbide inserts. 0.4 or 0.8
22/02/2020 07:00:31
Posted by Kiwi Bloke on 22/02/2020 02:35:25:

Without knowing about your lathe, it's impossible to offer useful advice. My experience is that 0.8mm tip dia. inserts don't suit a Myford Super 7 - it's just not rigid enough to work the insert at depths of cut and feed rates that justify the larger tip radius. However, an Emco Maximat Super 11 takes them in its stride - even 'blunt' inserts, designed for hogging off metal, rather than fine finishing - and with a very good surface finish. Not bashing Myfords, it's just horses for courses...

It’s a Warco wm290

21/02/2020 10:55:15

So prob best just to stick with what i Know, 0.4mm

21/02/2020 10:31:05

Time for some new inserts. I am after ferrous and non ferrous.

I seem to have always gone for what I got origionally when I bought the tool holder, 0.4 however I notice Arc also sell 0.8 and just wondering what the advantage/dissadvantage of the two sizes

Edited By petro1head on 21/02/2020 10:31:20

Thread: WM18 - Broken it again :(
17/02/2020 17:27:16

Well I seem to have done it again

This time was drilling a 22mm hole using low speed and all of a sudden the main RCD tripped.  Reset it and switch the mill on, nothing.  Replaced both fuses in the mill as both had blown.  Once replaced the motor fired up but sounded like it was sparking/arcing and would only turn at 250rpm no matter where the pot was turned to so I suspect the motor is broken, just wondering what test I can do before ringing Warco tomorrow?

Also just wondering how much a replacement motor may cost?

Edited By petro1head on 17/02/2020 17:38:37

Thread: Log in
15/02/2020 18:18:04

When on my main pc, win 10 using Firefox, it remembers my login however when using safari on the iPad I have to login every time

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