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Member postings for Johnboy25

Here is a list of all the postings Johnboy25 has made in our forums. Click on a thread name to jump to the thread.

Thread: QCTP For Boxford Model A
29/02/2016 21:16:05

I've bought bad tool holders that don't fit an original Dickson QCTH from one of the well known suppliers who had a stall at the MEX Sandown Park. I never sent them back - still have them. Useful as papper weights - Not!

Edited By Johnboy25 on 29/02/2016 21:16:40

Thread: Useless light bulbs.
29/02/2016 21:07:19

John... That's interesting - I know a friend of mine had a problem with head lights failing early due to a little higher than normal charging voltage from the alternator. I suggested putting two high current diode in series with the lamps to drop some about 1.5 Volts which he did. He then google the life of a lamp with reduced voltage to find the equation for determining life expectancy of a derated lamp. All I can remember is that there was a cude root in the equation! Wish I paid more attention! 🤔

29/02/2016 20:23:01

Before the days of multi chip LED's, I would use 28 Volt incandescent lamps in applications where it was required for indicators on control panels when using 24 Volt control circuits. This was a throw back from derating the operating voltage on aircraft instruments which I've used in the past. By lowering the voltage on the filament it increases the life of the lamp by a considerable amount. There is a law I belive governing this but I can't remember what it is! 😳

Thread: Flying Scotsman on its way to York
26/02/2016 08:21:43

The news event of the week and I missed it! 😂 Oh well - have try to watch it on ketchup TV on t'internet or iPlayer.


Thread: Ball bearing look-up table
26/02/2016 07:30:49

Found this on t'internet - a look-up table to determine various bearing specs.

Hope it of use.


Thread: 3D printing seems to have gone quiet. Where are we all at?
24/02/2016 16:15:23

I always thought airline food tasted a bit plastic even in first class... 😋

Joking aside - what is the components for Jason?

Edited By Johnboy25 on 24/02/2016 16:17:49

Thread: Bridgeport Circuit Questions
19/02/2016 12:20:18

Hi Norm.. Not sure what the 48/50v AC is used for but I'll take a look... I'm sure you've worked out the horizontal feed motor is powered from 110V (or 115V if for our American colleges) the motors rated at 370W if my memory correct. I was going to change the transformer just accommodate the feed motor plus a bit for the 110V control circuit.

If you're going the inverter route then a lot of the control harness will become obsolete - if your use to motor cycle wiring there nothing as complicated than that. Just the fast feed and motor feed speed needs a thought.

This style of control cabinet is too shallow to accommodate the inverter so it's planned to section the cabinet and weilding in a 50 mm or so to give me the depth. I was going to replace the entire control cabinet but the quality and the gauge of metal used is far superior than othe electrical enclosure I'm use to.

hope this helps... I'm in Reading if you need any other assistance.


19/02/2016 09:40:02

It's here two version of the U.K. Bridgport circuit schematic. Enjoy!


19/02/2016 09:24:54

Without reading through the whole thread - from the photo, it looks like the bottle fuse bottom left middle has blown... This type of fuse has an indicator that changes when it's done its job.

I'll carry on reading the rest of the thread now. 🤔


P.S. I had the same control box on my Bridgeport now fed via an inverter for the motor drive.

P.P.S. there is a circuit diagram on the Bridgeport user group on the yahoo site, I put it there for someone who needed it for this type of Bridgeport control cabinet. WADR - Les,  I'm  pretty sure this isn't the circuit diagram for this machine.

Edited By Johnboy25 on 19/02/2016 09:36:02

Thread: Glass scale (DRO) problem
18/02/2016 20:46:02

KWIL - thanks for that... Just found some clips on YouTube featuring Hiedenhain encoders.


Thread: Steel?
18/02/2016 20:28:23

British steel industry - RIP 🙁

P.S. If HS2 (heaven forbid!) go through - Who's going to supply the steel rails?

Edited By Johnboy25 on 18/02/2016 20:30:55

Thread: Glass scale (DRO) problem
18/02/2016 20:18:14

Is this the same construction of Heidenhain dro slides? I have a couple - the longest one has the rubber seals completely disintegrated. I haven't found any info on the web regarding stripping them down to repair or clean them as yet. I did want to start the job without an idea how they came apart. 😳


Thread: machine lighting
13/02/2016 21:34:26

Hi.. If you're going for LED lighting you would only need a power supply with a 1/10 of that mentioned. 65 Watts would fine for halogen lamps. Just a thought....


13/02/2016 15:46:30

I have a couple of these too - bought off eBay at a reasonable price. Their small enough to manipulate it to where you need the light especially when internal boring. They run on next to nothing giving a good colour temperature white light and don't get unduly hot.


Edited By Johnboy25 on 13/02/2016 15:47:59

Thread: First bit of Tooling
15/01/2016 20:31:16

Nice job 👍

Thread: Web Browsers
15/01/2016 20:24:34

Firefox is one of my favourite browsers.. I have installed it on to an 'old' Compaq laptop. I recently put Windows 7 which replaced Vista (Vista was the reason I stopped using it!) works much better with a memory upgrade. I was reliably informed that if I were to re configure with a semiconductor 'harddrive' it will be extremely quicker than it is now. I've see the result and sure enough to it boots up in a blink of an eye!

I want to use the laptop with a separate monitor for AutoCad and a CNC program. After a bit of research the Linux route with LinuxCNC looks promising.

Thread: What Did You Do Today (2016)
13/01/2016 20:37:20

My father was on escort duty with the Atlanic convoys during the World War II. One his favourite tales was what ever the weather was it would follow the convoy across from New York taking approx ten days to get across the Atlanic about the same time it took for the convoy to reach the UK. So when we saw the cold spells on the news from North America he would tell us that we'll be getting that soon - Mark my words! - more offten than not he was right! Bless his socks.....

I'll just go to find my thermal's!


Thread: Dehumidifiers
12/01/2016 20:49:00

Some good points Muzzer. Comparing the power consumed with other domestic appliance certainly put these dehumidifiers in perspective. I'm one of these people who literally boils enough water at a time for coffee or tea so I can rest easy knowing I'm trying to my bit!

12/01/2016 16:32:05

I understand where everyone is coming from regarding running costs but I think it was last year when we had a sudden temperature change - when I went out do a bit of swarf making I was distraught to say the least as all my cherished machinery look like it has spend the last couple of days in a Turkish bath - rust included! 😱

I use it sparingly - so far so good.

P.S. I don't have any connection with anyone selling these things! If I hadn't got mine 'on the cheap' I'd still be pulling my hair with all the damage with the condensation in my workshop. I'm hoping this year I can improve the workshop with a new roof and good insulation - prior to moving to the Somerset (above the flood level) as part of the retirement plan! 🤔

Thread: Interesting ?? ... or hype??
12/01/2016 16:10:48

Would like to see a computer animation of how it works - are there any out there? I haven't found one yet.


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