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Old 07-08-2015, 09:48 AM   #11
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Thank you all for your input and photos. I was looking at the unit from the dro store, however, I will have a look at the Ditron dro. I think I will go for the 2 axis unit. John


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Old 07-08-2015, 09:50 AM   #12
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Rod, where did you purchase your dro from?


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Old 07-09-2015, 09:11 AM   #13
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Quote:
Originally Posted by simister View Post
Rod, where did you purchase your dro from?
John, initially I saw a compact scale in a glass cabinet at Hare & Forbes and noted the brand as it was a lot more compact than the so called compact scales at DRO store etc.

I found Ditron on Alibaba and dealt direct. Search for Ditron DRO there. Cost was USD 370 landed back in January 2014 when the rate was good. $119 of that was DHL freight.

I went with 150mm DC11F slimline and 600mm DC11 1 micron scales which were both under USD $70.

The DC60-2V readout was USD $100 and they added Paypal fees of USD $15. The 150mm scale limits travel slightly. I knew that but it fitted nicely as you can see.

Much better quality than the stuff I paid $800 for for the incomplete SX3 milling kit which has a plastic readout case when Ditron is metal. Also Ditron Scale covers are superior.

When I mounted the long feed scale, I used a Ditron supplied angle bracket and a flat piece of 6mm aluminium for the read head.
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Old 07-09-2015, 10:43 PM   #14
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Thanks Rod,

That is really cheap. It will be more now because of the dollar but still should be a good price. I will have a look at Alibaba and check it out. I purchased a DRO for my mill from the Drostore and I am very happy with that unit. However, they are certainly more expensive that the prices you paid.

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Old 07-10-2015, 08:51 AM   #15
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Thanks Rod,

That is really cheap. It will be more now because of the dollar but still should be a good price. I will have a look at Alibaba and check it out. I purchased a DRO for my mill from the Drostore and I am very happy with that unit. However, they are certainly more expensive that the prices you paid.

John
Thats what I thought. I figured if H&F bought Ditron scales they would be pretty good quality as they don't buy at the bottom of the Chinese market but for me, the attraction was really the extra compact scale so I figured I might as well use all their gear.
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Old 07-10-2015, 06:20 PM   #16
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i never bothered fitting the scale to the compound slide as it is not something i think i will use and not worth the hassle but you may like it and for what the extra cost is may well be worth ordering the the 3 axis unit .Ian .
I have a different DRO system (Newall) but I find having compound readout is very useful for much the same reasons as having it on X&Y. Yes, it is a bit more cramped & maybe doesn't lend itself to certain scales & encoder blocks offered. Newall is quite compact, but I've also seen compound installs using the typically larger offshore gear.

Anyway, just for reference ideas, you can see my compound installation here.
http://www.homemodelenginemachinist....ad.php?t=19361
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Old 07-11-2015, 12:11 AM   #17
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You might think it a bit of an overkill, but I have fitted my lathe out with 2 x 2axis units and have found the topslide and tailstock ones are indispensible if doing any high precision work.
I was lucky and my machine could take the two extra ones using medium sized scales, but for a lathe of your size, you could always use the small pattern read heads, or even high res magnetic ones.

The tailstock was a bit fiddly to do as you have to cancel out the rotation (even though only tiny) of the quill. If you don't, you can easily bend the read heads out of adjustment. It is the same when using cheapo scales on the tailstock, you must find a way of cancelling out the quill rotation.

This is how to fit one correctly to the tailstock.

http://chestermachinetools.forumchit...post1286071543


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Old 07-11-2015, 12:53 AM   #18
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Timely post John. I'm doing a tailstock readout setup myself, but the el-cheapo electronic vernier style. Your detailed write up gave me some good ideas on mounting brackets & such.

I was going down the path of making my mount plate removable to get at the spindle oiler points. I noticed you had them to, but at different locations. Maybe I missed the detail, but did you re-drill them or have some alternative lube strategy as it looks like the DRO assembly covers them up?
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Old 07-11-2015, 06:20 AM   #19
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Peter,
That is the only downfall of my system, and I had to do some deep soul searching on that one.
I came to the conclusion that a quick strip down yearly, which I do as a matter of course on other parts of the machine to remove swarf/gunge etc will be good enough lube for the tailstock operating screw. The quill and home made bearing support gets a drop of ISO 32 whenever I squirt a bit into/onto other parts.
I was going to redrill new lube holes, but thought better of it.

For your type of scale mount, I would suggest you go down to the local model shop and get some linkage ball end fittings to connect the quill to the scale, they will get you over the quill rotation problem.

http://www.aliexpress.com/item/1-kit...376253110.html

Just a bit of threaded rod or sawn off thread from a tiny bolt between two of them makes a good linkage.

BTW, once you have done this mod, you will be amazed at just how accurately you can drill to exact depth using the tailstock.

Hope this helps


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Old 07-11-2015, 08:10 PM   #20
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Hello John and Peter (Petertha),
I put a tailstock readout on my Myford S7 a few years ago with the goal to retain full travel of the tailstock quill. To achieve that it required a bit of surgery to the tailstock body on the mill and some epoxy to smooth out the contour but it turned out well and works great.

I include some pictures to show the modifications and hope they are self explanatory. Feel free to ask if more clarification is required.

When I modified the tailstock, I also installed Newall Micron 10 two and three axis DRO's on the Myford S7 and the Myford VME mill. Will post pictures of that later.

Peter J.


Attached Thumbnails
Detail slider.jpg   Display at left.jpg   Display at right.jpg   Overview.jpg   Tailstock extended.jpg  

Tailstock front.jpg  
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