By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for Les Jones 1

Here is a list of all the postings Les Jones 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Faulty LED
17/07/2019 22:47:55

Are you sure that the socket for the tail light and the stop light are the same ? Some car bulbs are single centre contact. On these the connections are the single centre contact and the outer metal. The other type are small bayonet type and they have two have two contacts. The outer metal is not used as a connection on that type. There also combined stop and tail lights that use two contacts and the metal casing but you do not seem to have any of that type.

Les.

Thread: pc based dro
13/07/2019 18:44:52

There is a design that uses and android tablet which sound like what you want to do using a PC. I think the same basic idea could be used on a PC if you want to write the software. It was done many years ago with the "Yadro" DRO. This used a PC running DOS rather than Windows or linux. This is a link to the DRO running on an Android tablet.

Les.

Thread: Universal T milling machine from Chester : Issue with Starting
10/07/2019 17:44:27

Did you get 24 volts AC on the secondary of the 24 volt control transformer and the coil of KM1 ?
I still cannot read the terminal labels on the contactors and circuit breakers or the markers on the ends of the cables.
If your camera has a macro mode you could photograph the individual contactors and circuit breakers. You could also use manual focus instead of auto focus.

Les.

10/07/2019 09:36:49

First check that you have 24 volts AC on the secondary of of the 24 volt control transformer. I think it is the one at the top right of the control box. I can't see the labels clearly so can you take a properly focused picture (Or pictures.) of the control box with your camera pointing straight at it. (Not looking down at an angle as in your picture in your first post.) If you have 24 volts on the output of the transformer then check if you have 24 volts AC across the coil of KM1. (This contactor should be closed except when the emergency stop button is pressed.)

Les.

Thread: Power Feed on Bridgeport not working.
05/07/2019 10:12:11

Here is the schematic.

Erskine power feed schematic.jpg

Les.

04/07/2019 20:09:06

Here is a link to a post on another forum that is related to an Erskine power feed. It contains a schematic which should help tracing the problem. You may have to join the forum to view all of the information. If that is the case let me know and I will post the schematic here.

Les.

Thread: Satnav
23/06/2019 08:58:06

Hi John,
If the satnav has built in Bluetooth then it can probably be paired with Bluetooth headphones or a Bluetooth speaker. If not then you will probably have to dismantle it to bring out the loudspeaker connections.

Les.

 

Edited By Les Jones 1 on 23/06/2019 08:58:32

Thread: DIY magnetic DRO
01/05/2019 09:21:14

Hi Chris,
I have not noticed any mention of the magnetic strip to work with the encoders. You will also need to make a guide system to keep the encoders the correct distance from the magnetic strip.

Les.

Thread: DRO Z-Axis /4th axis "combiner"
27/04/2019 08:38:29

Hi Paul,
There is no real need for a circuit as Kealan gives the connections at the start of his program.
These are the lines that give the information.

Code intended for an arduino nano with the following wiring:
Pins 2, 4 : Scale 1 inputs
Pins 3, 5 : Scale 2 inputs
Arduino Pins 7, 8 : Outputs to DRO A and B pins.

The only other connections will be the power to the Arduino.

You will have to make sure that the signal level from the scales is the same as the signal levels on the version of Arduino that you use'

Les.

Edited By Les Jones 1 on 27/04/2019 08:42:47

Edited By Les Jones 1 on 27/04/2019 08:43:14

26/04/2019 21:32:15

I built a similar device many years ago for my Seig X3 mill and find it very useful. Mine works with the original Chinese scales (2 x 24 bit protocol). Mine is based on a Pic16f628 with a 4 line by 20 LCD display, It displays the reading from each scale and the sum of the readings.

Les.

Thread: edm machines
07/04/2019 09:00:16

I have built an EDM machine based on the bits of information I could find on the web about Ben Fleming's design. It is the capacitor discharge version as I could not fined enough information on his pulse version. (I was too mean to buy his books.) It works quite well.

Les.

Thread: Crabtree B15 3 phase Stop / Start switch
17/02/2019 14:31:54

Deleted.

Les

Edited By Les Jones 1 on 17/02/2019 14:34:14

17/02/2019 11:57:30

Hi Philip,
I just have the stop, emergency stop and interlock switches in the low voltage control inputs to my VFD I just use the switch on the 13 amp socket to switch the power to the inverter when the lathe is not in use. My view is that would be very unlikely to have a fault occur on the stop control input of the VFD at the same time as I needed to use the emergency stop. It would more likely fail with normal use of the stop button when it would be noticed and repaired.

Les.

16/02/2019 20:05:27

I don't see the point of of trying to use this starter on the input of the VFD. If you want to put an emergency stop button on the input to the VFD such as this one will be easier than trying to modify your existing 415 volt starter. The start and stop buttons will be connected to the low voltage control terminals on the VFD. (Some VFDs may require a small low voltage 12 or 24 volts relay as well as the two buttons)

Les.

Edited By Les Jones 1 on 16/02/2019 20:08:43

Edited By Les Jones 1 on 16/02/2019 20:09:50

Thread: Problems with NVR switch
15/02/2019 11:03:49

The lamp should be connected to L1 and L3 which are the two phases that feed the solenoid. I think you should put some markers on both ends of each of the red wires so you know which are the real phases and which is the ghost phase.

Les.

15/02/2019 09:03:43

Hi Miles,

If the light only works when the machine is running I think you have it wired to the output side of the contactor . (The side connected to the motor.) The incoming three phase from the static converter should be connected to the three lower connections (L1, L2, L3) and the motor connected to the three top connections. (A, B, C) If you have it connected with the incoming three phase to the top three terminals I don't see how it could have worked as there would be no power (From L1 & L3.) to power the solenoid. Can you post a diagram of how you have connected it showing which terminals are connected to the three phase from the static converter, which terminals are connected to the motor and how you have connected the start and stop buttons ? (I can't see any wires that look like they go to the start and stop buttons.

Hi Emgee,
I agree that is the most likely way the light would be powered. (That is the way it was done on machines in the factory I worked in in the mid 1960s.) I was thinking it may have been wired with a 240 volt lamp directly to the mains at some point in it's history.

Les.

14/02/2019 22:15:01

Is there a transformer between where the black cable comes out of the bottom right hand gland of the NVR and the lamp ? I think it is very unlikely that the bulb runs directly of 400 volts. (I am making the assumption that the static converter contains a 240 volt to 400 volt transformer and the motor is wired in star configuration for 400 volts phase to phase and not in delta configuration for 240 volts phase to phase.)

Les.

14/02/2019 18:14:15

I suspect that a thermal overload has tripped and needs resetting.The round knob on the right looks like it could be to set the thermal overload trip current. I expect there to be something in that area that needs resetting. I would also suggest measuring the resistance of the solenoid coil in case it has gone open circuit. (I am thinking it could be a 240 volt coil which is intended to be powered between a phase and neutral but has been connected to be powered between phases.) You could also check that all safety interlock switches are closed and that the stop buton is not open circuit. (The stop button will be normally closed contact that opens when pressed.)

Les.

Edited By Les Jones 1 on 14/02/2019 18:28:10

Thread: Telephone / Internet Scams
14/02/2019 07:47:56

Update on the scam call I had on 13/02/19.
I reported the problem to "Weebly". Several hours later I received an email from them saying that they had closed that website down.

Les.

13/02/2019 11:56:58

Hi Chris,
That's what I would normally do. I tried asking for an extension number so I could phone BT back from a number that I could find on their website. I have contacted my ISP and also Weebly so they can look at the user of that website address but I have not yet had a reply from them.

Les.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
TRANSWAVE Converters
Ausee.com.au
Eccentric July 5 2018
ChesterUK
Eccentric Engineering
Warco
Meridienne Sept 2019
Sarik
emcomachinetools
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest