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Member postings for Mike Poole

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

Thread: Aircraft General Discussion
26/06/2013 14:43:34

RAF merlins constantly as we are under the approach path for Benson. An occasional treat is the Martin Baker Meteor for ejector seat testing but I have not seen it for a while.

Mike

Thread: Another motor wiring question
25/06/2013 02:57:49

So is Ians motor being overstressed by a 240V full wave rectified supply? I think it is a bit and to add smoothing will make it worse and also watch out for the current pulse to charge any smoothing caps damaging the rectfiers.

Mike

25/06/2013 01:25:47

A full wave rectified 240Vrms sine wave will vary from 0V to a peak of 340V if I store energy in a capacitor and maintain a voltage with a bit of ripple that does not drop to 0V I will have a waveform that is no longer a rectified sine wave but a slightly rough DC at a voltage above 240V DC and Below 340V DC

Mike

25/06/2013 00:11:25

It is stored in the capacitors and supplied to the load when the supply voltage drops below the charge voltage of the caps.

Mike

24/06/2013 23:28:42

The motor is rated at 200/220V DC. 240V rms provides the equivalent heating effect of 240V DC. To apply smoothing will raise that DC voltage. 340V is the peak voltage so depending how much capacitance is used will decide the ripple on the supply, some big caps could push the DC towards 300V

Mike

Thread: Aircraft General Discussion
24/06/2013 21:56:54

It would seem the RAF would  shoot an airliner down

**LINK**

Mike

Edited By Michael Poole on 24/06/2013 21:57:13

Thread: Taps and dies
24/06/2013 15:18:42

The great thing about HSS was that it would hold its temper at red heat, not a situation a tap is likely to encounter. Carbon steel has alot of fans for taking a keener edge than HSS. Taps made from HSS are usually ground after hardening which makes a high quality tap. I do not think HSS is any tougher than properly hardened and tempered carbon steel. What do the metalurgists think?

Mike

Thread: Chesterman 369 height gauge
24/06/2013 14:48:11

I think it is for measuring the depth of holes

mike

Thread: Taps and dies
23/06/2013 20:03:01

Carbon steel taps can be softened if you have the misfortune to break one in steel,EDM is probably the only solution with HSS

Mike

Thread: Another motor wiring question
23/06/2013 14:31:49

Rectifying the mains which if you are in th UK is most likely to be 240v will give a peak voltage of nearly 340v applying smoothing will bring the DC voltage well above the 200/220 the motor is rated at. It may run happily for ever on this supply or may shorten its life.

Mike

Thread: Power feed transformer wiring
19/06/2013 15:19:54

This has a 100hp variable speed DC motor on the spindle. I think it would take some stalling but it did take some rather large cutters

Edited By Michael Poole on 19/06/2013 15:39:51

Thread: Aircraft General Discussion
17/06/2013 14:49:20

If it posed athreat to a population centre or other aircraft I am sure it would be shot down.

Mike

Thread: Power feed transformer wiring
17/06/2013 07:39:56

It would appear the Align power feed units can be fitted with over travel limit switches, so if a relay is wired to be energised by the motor power (after the contactor and overload) then a contact from this relay could be wired into the overtravel circuit which would stop the feed if the motor power failed.

Sensors are available to detect shaft motion and one of these could be used in the same way.

A bypass would be useful for the rapid travel and setting up without the spindle running, but the manual handles are always available.

Mike

Thread: Adjustable Tool Rest for my 8" Bench Grinder
28/05/2013 12:58:17

**LINK**

WDS have a wide range of useful parts, no connection.

Mike

Thread: What is this tool?
25/05/2013 23:50:18

**LINK**

try here for inserts for various materials

http://www.cutweltools.co.uk/files/ww/IM%20B25-32.pdf

and here for info on the body

mike

 

Edited By Michael Poole on 25/05/2013 23:57:01

Edited By Michael Poole on 25/05/2013 23:57:55

23/05/2013 20:06:00

Cutwel list this holder and supply inserts. It is a Korloy Alpha mill and takes APMT11T3 inserts looks like they are around £5 each so about £135 to fully populate it.

Mike

Edited By Michael Poole on 23/05/2013 20:09:52

Thread: Banned from workshop.
01/05/2013 22:17:42

I've been trying to get my 20yr old still at home to sign up for this one way trip to Mars,doesn't seem keen though.

Mike

Edited By Michael Poole on 01/05/2013 23:19:00

Thread: A & R Precision 'Dickson' Toolpost -- Screws Used
23/04/2013 13:32:14

I find the biggest irratation with cap screws is that the socket fills with swarf, the larger sizes use square heads and don't retain swarf.

mike

22/04/2013 23:22:30

2BA is another thread very close to M5x0.8. Myford use both on the ML7R cross slide adjusment and locking screws be careful not to mix them up.

Mike

Edited By Michael Poole on 22/04/2013 23:25:02

Thread: First attempt at silver soldering :-(
22/04/2013 03:17:55

the components to be silver soldered will need to reach the red heat range. Silver solders melt in the range 630 - 780 degrees which is in the red heat range. The top end of this range may be a bit ambitious for a propane torch.

Mike

Edited By Michael Poole on 22/04/2013 03:19:46

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