By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Choiceof DRO

All Topics | Latest Posts

Search for:  in Thread Title in  
Andy Freeman 115/09/2012 23:40:35
50 forum posts
33 photos

I am looking at fitting a DRO to my Myford Super 7.

I have found two makes, one called 'Electronica' (www.electronicaems.co.uk)

and the other is Acu-Rite which have a great display unit but looks very expensive.

Has anyone had experince of using either of these?

Thanks

Jon16/09/2012 01:30:37
1001 forum posts
49 photos

Have a look at their Magna S1, the backing and reader look exactly same as Allendale i currently use. Need the finest resolution for repeatability. 1 Micron res http://www.machine-dro.co.uk/magnetic-linear-encoder-reading-head-1-micron-resolution.html + two part backing and tape. Can use cheaper glass for X axis.

I have never seen a decent glass install on an ML7 even from the pros. Its all a compromise and means loosing something greatly needed but the magnetic could solve that on Y axis, glass on X axis at rear.

The readouts i have seen on a certain selling site. Just check zero maintained when powered off and can half Y axis independant of X axis or you would be taking double the cut off the diameter and cant do that with Allendale budget readouts.

Douglas Johnston16/09/2012 11:23:11
avatar
814 forum posts
36 photos

I have just fitted a 1 micron magnetic scale to the cross slide of a Myford Speed 10, fitting the scale under the slide to keep it out of the way. I was always put off fitting a scale down the side of the slide because it would get in the way of things, but this way works a treat. It is a bit more work to do it this way but well worthwhile. The only downside would be a clash with a rear mounted taper turning attachment (as well as the cost -these magnetic scales are not cheap but you soon forget the expense)

Doug

maurice bennie16/09/2012 12:14:44
164 forum posts
1 photos

HI Would Douglas please explain a bit more how he fitted his scale , it sounds a good idea.

Maurice B

blowlamp16/09/2012 12:22:21
avatar
1885 forum posts
111 photos

Why not go with the Sino/Sinpo etc DROs that are more commonly available and probably much cheaper?

Martin.

Douglas Johnston17/09/2012 09:31:38
avatar
814 forum posts
36 photos

Hi Maurice, the magnetic sensor is only approx. 5cm long, 1cm wide and 1.7cm high and fits onto an L shaped bracket fixed to the back of the cross slide base. I had to machine a flat area on the base to achieve this. I have a long cross slide on the lathe and I extended this by another 5cm with a block of aluminium bolted to the end, then machined a 1cm wide area about 1mm deep along the underside of the slide and aluminium block, into which the magnetic tape was located using superglue. A thin non magnetic metal plate was fitted over the magnetic strip to protect it from any machining oil or debris.

Careful alignment was needed to achieve the right gap between the magnetic tape and sensor and to avoid conflict with the cross slide screw. The cable from the sensor was routed under the lathe bed and connected to the same digital readout used for the mill. I made a switchover box so that I could select the output from either the mill Z axis or the lathe cross slide sensor.

If anyone is interested I can take some pictures and post them if I can work out how to do it.

Doug

Paul Barrett17/09/2012 10:37:41
59 forum posts
16 photos

Yes please

Douglas Johnston17/09/2012 15:34:30
avatar
814 forum posts
36 photos

I've uploaded five pictures of the DRO into an album.

Doug

Russell Eberhardt17/09/2012 16:40:45
avatar
2785 forum posts
87 photos
Posted by Jon on 16/09/2012 01:30:37:

Need the finest resolution for repeatability. 1 Micron res http://www.machine-dro.co.uk/magnetic-linear-encoder-reading-head-1-micron-resolution.html

1 micron!! That's a 25th of a thou in old money. I can only dream of working to such accuracysad

Russell.

Douglas Johnston17/09/2012 17:15:10
avatar
814 forum posts
36 photos

It is not a matter of working to an accuracy of 1 micron, the 1 micron resolution simply makes it easier to get a decent accuracy. Remember resolution and accuracy are two different things.

Doug

All Topics | Latest Posts

Please login to post a reply.

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

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
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

 

Donate

donate