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

Member postings for Alan Jackson

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

Thread: Lathe bed badly worn
27/11/2014 18:40:21

Frank I bought a 1956 Chipmaster and when I got it in my workshop (with great difficulty) I found it had the same conditions you described. So I took a series of measurements along the be using the dismantled tailstock base as a carrier with a dial guage measuring various points at say 1" intervals along the bed. I then made up some sanding blocks by gluing a belt sander belt cut in strips to pieces of wood and literally sanded the bed where it was not worn to get it down to the worn level. This may sound like a crude break it or fix it solution but it worked well. The tailstock base was also worn lower at the front so I shimmed it at the base so that it was parallel it both directions which then made it too high I think. This was solved by making a new eccentric Morse taper 3 external Morse taper 2 internal adaptor which I rotated to get at centre height and the tailstock can then be adjusted to get on centre at the base as normal. I wanted a Morse No2 tailstock anyway. The final result was a lathe which can turn over 20" length to within .0005". Good enough for me. People have told me that Chipmasters had hardened beds but if mine has it did not stop the the process. In a way I had no other choice but it worked out very well. I will add some photos to my other pics.

Alan

Edited By Alan Jackson on 27/11/2014 18:42:12

Thread: Stepperhead Lathe Construction - Technical Notes
16/10/2014 10:36:24

Andrew & Niel,

I have rearranged my text to show the settings clearer and updated the settings to what I have now hope this is more clear.

Regards

Alan

 

Stepper Motor Settings

Here are the settings I have been using on my machine. There is much scope for changing these settings for more power and faster performance. I have selected settings that work ok and are just powerful enough so the axis can be stopped on meeting too much resistance without hopefully too much damage if things go wrong. You may want to experiment with these settings to suit your requirements so feel free.

 

These are the dip switch settings on the stepper motor drivers.

 

Z Axis (Saddle)

SW1 ON

SW2 OFF

SW3 ON

SW4 ON

SW5 ON

SW6 OFF

SW7 OFF

SW8 OFF

 

1.46 A Peak

800pulses/rev

1 rev = 0.100”

 

 

 

X Axis (Cross slide)

SW1 ON

SW2 OFF

SW3 ON

SW4 ON

SW5 OFF

SW6 ON

SW7 ON

SW8 ON

 

1.46A Peak

400pulses/rev

1 rev = 0.005

 

 

 

A Axis (Headstock)

SW1 ON

SW2 OFF

SW3 ON

SW4 ON

SW5 OFF

SW6 ON

SW7 ON

SW8 ON

 

1.91A Peak

400pulses/rev

1 rev = 4°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Edited By Alan Jackson on 16/10/2014 10:38:10

16/10/2014 10:01:54

Hi Andrew and Neil,

I have looked at the original text and the stepper motor settings seem to have got slightly out of sync in the MEW files. Here below was what was intended. Hope this clarifies things.

Regards

Alan

 

 

Stepper Motor Settings

Here are the settings I have been using on my machine. There is much scope for changing these settings for more power and faster performance. I have selected settings that work ok and are just powerful enough so the axis can be stopped on meeting too much resistance without hopefully too much damage if things go wrong. You may want to experiment with these settings to suit your requirements so feel free.

 

These are the dip switch settings on the stepper motor drivers.

 

Z Axis (Saddle) X Axis (Cross slide) A Axis (Headstock)

SW1 OFF SW1 OFF SW1 ON

SW2 ON SW2 ON SW2 OFF

SW3 ON SW3 ON SW3 ON

SW4 ON SW4 ON SW4 ON

SW5 ON SW5 OFF SW5 OFF

SW6 OFF SW6 ON SW6 ON

SW7 ON SW7 ON SW7 ON

SW8 ON SW8 ON SW7 ON

 

1.46 A Peak 1.46A Peak 1.91A Peak

800pulses/rev 400pulses/rev 400pulses/rev

1 rev = 0.100” 1 rev = 0.005” 1 rev = 4°

 

Something seems to go wrong in sending this, because what I sent shows the thee axes Z, X & A as headers with the individual sets of information listed below each axis., not like is shown in the MEW post. I will rearrange this text to show it better in the MEW post, because otherwise this will just add confusion to something I was trying to show as a simplification.

Edited By Alan Jackson on 16/10/2014 10:07:26

16/10/2014 09:43:33

Yes i think you are correct Michael. It seems to be a pdf error, the last line states "1 rev =4(square symbol)" should read "1 rev = 4 degrees" . I do not know how to input the degree symbol and neither does the pdf system. The whole data here is just a copy from the computer files and the pdf conversion has imported this error. I could correct this and resend it to Neil if it is deemed neccessary. Well spotted.

Regards

Alan

Thread: Favourite Engineering quotes.
26/09/2014 10:03:24

Here is a draughtsman's one. "You can lead a horse to water, but a pencil must be lead"

Alan

Edited By Alan Jackson on 26/09/2014 10:03:42

Thread: What pulleys to use for a milling machine and VFD.
07/08/2014 10:28:55

I have added a Polyvee drive to the Dore Westbury milling head on my Tom Senior M1 milling machine. It has three belt pulleys but I rarely use the other pulleys just the mid range and an inverter control to the half HP motor. This works very well. I Was going to add a couple of photos in my photos section, but I cannot not see how to do it. Has something changed? Found it under "Albums," Who would have thought it?

Alan

Edited By Alan Jackson on 07/08/2014 10:42:06

Edited By Alan Jackson on 07/08/2014 10:53:29

Thread: Granite Lathe Platform
12/06/2014 10:51:30

That at least gives a new dimension to turning in your grave.

Alan

Thread: Design & Machining Bevel Gears in MEW 216
08/05/2014 10:08:03

I would like to congratulate Andrew Johnston for his well researched and concise article on bevel gears. While I have no intention of doing the same thing, even if I had his skills, it is nice to see how he mastered CAD and CAM to get his great results. Looks like its going to be a great traction engine.

Alan

Thread: supercharged V12 2 stroke
09/04/2014 10:09:18

Dean, you cannot stop now. This work of art as you have shown is full of trials and tribulations and "can't be bothereditess" is the hurdle you must (just for your fans, me included) overcome. More power required Egore.

Alan

Thread: Fibre optic clock
02/04/2014 11:26:52

I have just tuned into this thread and learnt a lot about steampunkery etc and I am also very pleased to be able to see such originality, creativity and brilliant craftsmanship, superb.

Alan

Thread: Lathe facing convex or concave
22/03/2014 11:03:15

Assuming at first that the lathe mandrel axis is parallel to the bedways. and the lathe turns parallel. I think the best way to find out how accurate the cross slide axis is at right angles to the lathe mandrel axis is to do this. Place a parallel flat bar, approximately centrally, lightly clamped in the three or four jaw chuck. The length of the bar should be at least long enough to cover the full cross slide travel. Put a dial indicator on the cross slide or it can be mounted in the tool holder on the topslide. Bring the dial indicator into contact with one end of the horizontal bar and note the reading. Rotate the mandrel 180 degrees and again note the reading. Adjust the bar so that the two readings are equal. The outer face of the bar is now at right angles to the mandrel axis. With the bar set horizontally the dial indicator can now be traversed along the bar using the full travel of the cross slide to get a reading of the cross slide axis at right angles to the mandrel axis. (You can do this with the saddle locked and unlocked to note any difference). This will now tell you where the error, if any, lies. The only way this error can be corrected is to remove metal from the guide surface of either the saddle cross slide guide (front vee slide surface) or from the saddle bed guideway to get the cross slide guideway at right angles to the mandrel axis. It is probably easier to correct the error on the saddle bed guideway because it avoids having the mess with the parallel guideways of the crosslide. This may sound a dramatic fix but it is probably means only a few thou will be removed to get the desired result.

Alan

Edited By Alan Jackson on 22/03/2014 11:04:40

Edited By Alan Jackson on 22/03/2014 11:11:48

Thread: MEW 214
09/03/2014 10:36:47

What about the advice about running a cable underground. "I have not run a cable underground so do take professional advice on this. Perhaps an internet search will reveal what precautions to take?" Surely it it would be quicker to consult all these questions to the internet if there is no advice from the article concerning supply in power etc to a workshop. Why buy the magazine.

Alan

Thread: What did you do today? (2013)
28/12/2013 10:02:06

Commiserations KWIL horrible wind blew nobody any good, hope you manage to fix up your roof without too much hardship.

Best Regards

Alan

Thread: ML7 Topslide limitations
09/12/2013 17:14:53

I have just added some photos of a Lever Locking Top slide conversion for a Myford ML7. I made this a few years ago. I know as John S. has just referred to that Myford owners do not like to modify their machines but in my opinion it is well worth doing. I have a Colchester Chipmaster lathe with a similar conversion and would not like to go back to the original arrangement trying to access nuts in slots filled with swarf etc.

Alan

Thread: Rear Tool Post
30/11/2013 11:16:59

Here is what I made, the base has a slight taper to set the centre height. The photos are in my album

Alan

Edited By Alan Jackson on 30/11/2013 11:43:05

Thread: Old hacsaw blades
11/11/2013 10:15:45

I made a hacksaw sharpening jig by clamping the hacksaw blade in a slit cut in a piece of gas pipe which had a lathe centre support on one end. This assembly was mounted in the lathe with the screw pitch set to the teeth pitch. A dremel was mounted on the topslide with a thin grinding disc and the teeth were sharpened by powering the dremel while the sawblade was rotated at the screw pitch. It worked really well, the saw blades were nice and sharp , really good for brass.

Alan

Thread: Members photos
02/11/2013 18:33:44

Thank you all, it was as you say over exuberance with Adblock. It now works as you say. Now I can view all you brilliant work.

Regards

Alan

02/11/2013 16:17:11

Thank you John and Alan for your replies, but I do not have those arrows on the bottom left and right. I am using windows XP and Mozilla Firefox which seem to work quite well in other aspects. The only thing is, maybe I have used Ablock on this site and that could be the problem. I am glad that it does work for everybody else. It just seemed that the system could be better but now I realise it is me, again who else?

Thanks

Alan

02/11/2013 11:31:15

Is it possible for this web page to be made so that members photos can be viewed progressively, i.e. one after the other rather than having to close the photo and go back to the small viewed album selection to open another photo. (That is how I seem to have to do it) It is a rather laborious method of enabling viewing. After all photobucket an Flickr can do it.

Regards

Alan

Thread: Motorbike I built.............
05/10/2013 12:11:06

Thank you for your post Shaun, I read all through your Barbarian build and you have my greatest admiration, more power to you

Alan

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

Latest Forum Posts
Support Our Partners
JD Metals
emcomachinetools
ChesterUK
Eccentric July 5 2018
cowells
Warco
Eccentric Engineering
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