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Member postings for Dave Halford

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

Thread: Wire wicks
18/01/2022 11:45:08

You need to view the second video to see some of the issues encountered. The first video is all filler and no substance.

Thread: Information sought on radio controlled gas fired 5" gauge locomotives es
17/01/2022 19:23:33

RC servos are mostly rotary so perhaps you could hide them in a false fronted tender. The water gauges could be watched via a drone video unit.

gas on /off on a flick switch.

regulator on a throttle stick

reverser might have to be forward only.

Fine control can be done via the stick trim pots if necessary.

I suspect most if not all engineer their own solutions.

Thread: 180v motor not working on new control board
14/01/2022 19:10:46

HP 2/ 4, the motor may be too big for the board or you need to use the correct motor terminals.

don't connect wires to 6& 7

Thread: VM12 Mill
14/01/2022 17:41:30

what make?

Edited By Dave Halford on 14/01/2022 17:43:25

Thread: 180v motor not working on new control board
14/01/2022 17:39:12

The US is 120V @ 60hz

Thread: Milling machine advice
14/01/2022 17:09:30

The current price of old iron is now too high to be worthwhile unless you get lucky.

That said you are used to using an industrial machine and hobby machines don't compare well on the duty cycle but as long as you keep that in mind it'll be fine.

Same goes for motor power, everyone knows that 0.75kw is 1hp in old money and that works for mains motors. However DC hobby ones will sometimes say powerful 350W motor and if it doesn't say output then it's the motor power consumption which is much higher than the usable output.

Thread: Chester Conquest Mill Spindle
14/01/2022 11:36:28

All the above said, if some annoying tech has assembled the shaft with bearing fit you may need to apply a fair bit of heat to remove the key or bearing inner.

Thread: Model Engineering Website
14/01/2022 11:17:44

The only time I have had weird display patterns from a site was when the video card was dying.

Thread: Stewart S50 Name
13/01/2022 17:49:24

These were originally supplied ready machined just needing a screwdriver, a spanner and pliers

Thread: Are standard "M4" nuts & bolts normally fine or course pitch?
13/01/2022 11:13:40
Posted by John Smith 47 on 12/01/2022 23:35:10:

OK now I'm rather bemused. I have a collection of nuts and bolts that I've bought over the years. I have always tried to buy metric, but now that I measure some of them at c. 4mm diameter, the actual diameter seems measure c.3.86 to 3.89mm, but I can't get the nuts to fit onto my "4 x 0.7" metric tap.

Which seems more likely: Have I accidentally bought Imperial nuts & bolts (i.e. "5/32 inch"?), or are are they fine not coarse pitch?

J

EDIT: As a rule of thumb, how much smaller should the hole that I drill be if I am going to tap it? At these sizes would 0.5mm smaller suffice?
e.g. If I am going to fit a M4 bolt should I use a 3.5mm drill?
And if I am going to fit a M5 bolt should I use a 4.5mm drill?

Edited By John Smith 47 on 12/01/2022 23:46:36

John,

Don't forget the other variable may be the tap, speaking as someone who has bought a new tap from an English supplier at a show, that looks like a tap, but fails to make any kind of thread at all.

For tapping hole sizes buy a Zeus book. Nuts and Bolts from the like of Big Box DIY stores tend to be loose fit, whereas automotive stuff is a much tighter spec.

Thread: "Self-aligning spherical washers" for a 6in grinder with side-wobble?
11/01/2022 20:56:17

There should be thick card washers supplied with the wheel you need to use them on both sides.

Thread: Tank less Compressor
11/01/2022 17:16:25

Here

Mostly used on constant bleed spray guns.

It would depend on the capacity of the engine/s

Thread: Replace Speaker Surrounds
11/01/2022 17:05:49

Neil,

Are they still as loud as before?

Thread: COLCHESTER BANTAM PROBLEM
10/01/2022 12:02:32
Posted by needleworks on 10/01/2022 06:46:42:

Thanks Brian, had a shot at fixing it this weekend and here's where I'm at now. I got one of my friends round who is actually a plant electrician, which means he works with 3ph motors all day long. I purchased another rotary cam switch which he said "yeah, that should do" He wired it up according to the numbering which was already on the old switch, and nothing ! He checked again, moved a couple of wires around, this time the contactor clicked in, but as soon as he tried to put it in either forward or reverse, it just tripped the breaker. We tried for over 4 hours with a combination of moving wires to where he thought they should be, but all we can come up with is either nothing or a tripped circuit. Does anyone know if we are missing something here as I am starting to pull my hair out ! Surely it's only a simple switch !

Yeah, but no.

The original switch melted and kept popping you overloads and now a new one does the same. Surprised your Sparky didn't put a clamp meter on it to check the current draw though if he only fitted new equipment he might not expect it.

Frankly this screams motor field coil fault as a next thing to check for.

Thread: Boring bars
10/01/2022 10:49:08

dsc02703.jpgI'm talking about these, more properly boring bar holders, they will take round HSS or the boring bars above

dsc02702.jpg

Plus a normal Armstrong tool holder.

dsc02704.jpg

Thread: Building a Minnie
09/01/2022 16:04:35

Expensive scrap.

Be just about ok if it included all the gears and drawings + a few castings

09/01/2022 11:42:29

Errm anyone? **LINK** be quick

Thread: Boring bars
09/01/2022 11:34:13

These holders all fit either lantern style posts or need a clamp making. I think they are forged.

Thread: Building a Minnie
08/01/2022 19:21:25
Posted by Nick Welburn on 08/01/2022 12:01:05:

There is a part completed one, its very local to me - a good start point? or a load of potentially challenging mis made bits? Looks like castings are 450, drawings 50, and a boiler kit 225 - so its potentially a good buy?

I'd be loathe to by a part restored car, do part built steam kits land in the same place?

Edited By JasonB on 08/01/2022 12:06:56

Based on that picture and words.

If the 'boiler' is just a tube propped up on something and assuming the flywheel doesn't wobble and the wheels are OK then it might be fine.

If there's a boiler under there, the presence of the kit tells you the boiler is likely bad. They have a nasty habit of bending, not being square, just not made properly or getting dropped.

08/01/2022 12:17:54

There are various threads on here from Minnie builders, check the start to finish time lines so you don't get surprised by the work load.

Masons book is useful in that it tells you which parts cannot be made in isolation as they need to be made to fit others, like the tender needs to fit the horn plates, which depends on the width the boiler comes out at.

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