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Help with Myford ML7 please

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Nobby22/01/2013 22:29:42
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587 forum posts
113 photos

Hi JP & guys
Sorry I should have menioned . Remove support before final seperation . As Ady1 says I dont know but is there some thrust bearings on the ml7 that may need adjusting or shims to be remove to help the headstock to be more rigid when parting off. My myford is a s7 mark one and i always try to part from the back . But DONT try and part from the front with the tool upside down & the lathe in reverse as the chuck is screwed on one . and will unscrew when cutting. Awaiting flack?

Nobby

NJH22/01/2013 23:28:00
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2314 forum posts
139 photos

Hi JP

All good suggestions here and I rate David's tool as the best in my collection.

I have found the tool shown below useful for the more "delicate" operations.

Cheers

Norman

 

front.jpgside.jpgtop.jpg

Edited By NJH on 22/01/2013 23:41:21

Kevin F22/01/2013 23:29:57
96 forum posts
24 photos

I used to have a problem with parting off on my Myford , I tried various parting tools, hss,carbide and a tipped parting system ,these all failed and through research and trial and error ,I found that the following all contributed too ' chatter ' spindle speed, width of parting tool, work piece support and lack of coolant.

through my own experience the latter all helped , a low spindle speed ,a form of coolant ,I use wd40 on aluminium, a thin parting tool ie 1.5 mm ground from hss and locking the saddle and parting off as close too the chuck as possible all helped ,personally I found a rear tool post has to be the most effective way of parting off , also intermittent cutting causes bad chatter .

Edited By Kevin Fenrich on 22/01/2013 23:31:35

David Littlewood23/01/2013 12:31:35
533 forum posts

Good point, Norman. If, like me, you do much smaller-scale work (O gauge loco building in my case) then one of these sets is the dog's b******s:

**LINK**

- but see kit at bottom of next catalogue page (523C), for some reason I can't get the link to go there.

Rather expensive, but if you look in th MSC monthly sales flyer they are often much reduced (£86 + VAT instead of £135 + VAT this month). For parting off thin-walled 2 mm brass tube there's nothing to beat it.

David

Edited By David Littlewood on 23/01/2013 12:35:25

KWIL23/01/2013 14:00:43
3681 forum posts
70 photos

I part on my S7 usually dry and with a Q Cut type tool, just been cutting some MS round bar 200 - 400rpm, also some 3mm at 1000 rpm. What is the problem? I agree with David Littlewood, the Minithin system is also great, use it for e clip grooves and similar, made my own toolholders though.

JP Santos23/01/2013 20:23:56
49 forum posts
9 photos

Hi gents

thanks for so many replies....wasnt expecting that.

Clearly there's a lot of things for me to try out, and I cant go anywhere near my lathe as been put on antibiotics by the doctor... my flu has turned into a double chest infection! great!

Seen a couple of rear toolposts on ebay recently, but i'm trying to hold off on buying it as I want to first try the backgear option and see how it goes...

Some of the tools shown are really precise stuff, I dont really need that as the work im doing is on motorbikes, it really doesnt need to be very accurate...

Kevin F23/01/2013 20:39:55
96 forum posts
24 photos
Posted by JP Santos on 23/01/2013 20:23:56:


Clearly there's a lot of things for me to try out, and I cant go anywhere near my lathe as been put on antibiotics by the doctor... my flu has turned into a double chest infection! great!

 

 

 

Get well soon and let us know how you get on .

 

 

Edited By Kevin Fenrich on 23/01/2013 20:40:15

Edited By Kevin Fenrich on 23/01/2013 20:40:35

JP Santos24/01/2013 16:58:23
49 forum posts
9 photos

good news! was itching to try the new advice, so I went in the garage today to investigate this backgear thing....

undid the little screw and slid the piece back, and my back gear was spinning fine! By now I was already pleased with it

Tried it then on a very slow speed, I think 35? cant remember now, it chatter, but then changed the belt to the most left position, which I think gives a speed of 200.... and it started parting off beauitifully! chips coming away nicely just like I'd seen in the youtube videos hehehe

Really happy with it, no chatter, i mantained a steady feed in, cutting fluid thrown on it... beauty!

Looks like I wont need to buy the rear tool post after all

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