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Jan 14, 2014 21:40:04 GMT
Post by Deleted on Jan 14, 2014 21:40:04 GMT
OK, who's going to rise to this particular "bait" then ??-------- (JULIAN, they never learn, do they ??)
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Jan 14, 2014 22:15:59 GMT
hi alan, im not going to comment other than i know how fanatical LNER fans can be, and just remind them of the interchange trials of 1925! nuff sed! cheers, julian
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V2
Jan 14, 2014 22:25:07 GMT
Post by Deleted on Jan 14, 2014 22:25:07 GMT
I love them both, in fact I also have a soft spot for Midland, never been a fan of southern though but this probably all relates to what my late grandfather had in his collection as it was he who first introduced me to trains... no need to say what my favourite is though... Pete
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V2
Jan 15, 2014 0:36:15 GMT
Post by Deleted on Jan 15, 2014 0:36:15 GMT
centrebigends.co.uk
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V2
Jan 16, 2014 20:00:59 GMT
Post by Deleted on Jan 16, 2014 20:00:59 GMT
looking good Ben... well done.. regarding the bad luck with parting... as they say **** happens... just move on mate your doing a great job...
regards
Pete
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Jan 16, 2014 20:50:20 GMT
Post by Deleted on Jan 16, 2014 20:50:20 GMT
Have you considered using the paring tool at the back of the slide and inverted ?? ( Assuming you can get a tool holder to fit )
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Jan 16, 2014 21:52:00 GMT
Post by Deleted on Jan 16, 2014 21:52:00 GMT
The parting off tool dug into the stainless as I was about 3/4 the way through, shattering the parting off blade and causing the jaws of the chuck to leave big dents in one of the shanks. Were you using any cutting oil while parting off? I always flood the cut with Rocol RTD, applied with an old pastry brush. On a deep cut like this, you can also reduce the tendency to jam by widening the cut out as you go. I would also agree that a rear tool post with inverted tool is best for parting off - however, you might find the standard ML7 cross slide is too short to take a rear post.
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jma1009
Elder Statesman
Posts: 5,901
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V2
Jan 16, 2014 22:31:07 GMT
Post by jma1009 on Jan 16, 2014 22:31:07 GMT
hi ben, sorry to hear of the parting problem. im a bit of a dinosaur where these things are concerned especially with say stainless and hacksaw the stuff in the lathe. no shame in that in my book. myfords seem to be prone to such problems hence the rear tool post suggestion - though i think with stainless that isnt 100% guarantee of success. stainless hardenens as machined unless you can take a generous cut, and is pretty awful stuff to try and part off a big lump. cheers, julian
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JDEng
Part of the e-furniture
Posts: 384
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V2
Jan 17, 2014 8:23:28 GMT
Post by JDEng on Jan 17, 2014 8:23:28 GMT
Ben,
What grade of stainless are you using? T303 is readily available and is free machining; I've never had a problem with it. A lot (not all) of the other grades work harden and can be very difficult to machine or even drill.
John.
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Jan 19, 2014 12:57:23 GMT
Post by Roger on Jan 19, 2014 12:57:23 GMT
The parting off tool dug into the stainless as I was about 3/4 the way through, shattering the parting off blade and causing the jaws of the chuck to leave big dents in one of the shanks. I sawed through the rest of the way and came out of it with only 1 buffer head rather than 2. Oh well live and learn! To be honest, unless you've got a very rigid machine, parting stainless is going to be difficult. Torque is the enemy in my opinion. We know that we want a slow speed, but we don't want all of the torque that goes with it. I'm a big fan of variable speed drives because you can select a higher ratio than you would with a fixed speed motor and then use a lower motor speed. That way the lathe will just stop rather than try to destroy itself. With that setup, I just boldly stick on the power feed and let it get on with it. The bigger the lathe the more of a problem this is, but they can be tamed as I've described and make parting off less of an adventure. Roger
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Jan 20, 2014 20:26:01 GMT
Post by Roger on Jan 20, 2014 20:26:01 GMT
Hi Roger, Hmmm, I'll just keep on grafting away the way I am then, not got power feed on the ML7. Cheers Ben That's a pity, power feed is so useful. There may still be one thing that might help avert disaster, and that's if you can slacken the drive belt when you're parting off. I used to do that on my old Southbend when it had flat belts. It didn't work when I put polyvee grooves in the flat pulleys though, they were much more grippy.
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Jan 21, 2014 13:31:51 GMT
Post by ejparrott on Jan 21, 2014 13:31:51 GMT
316 stainless should be fine, are you sure its 316?
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Jan 21, 2014 20:50:11 GMT
Post by Deleted on Jan 21, 2014 20:50:11 GMT
Sorry but this just HAD to be posted}------------
JULIET Sweet, so would I. Yet I should kill thee with much cherishing. Good night, good night! Parting is such sweet sorrow That I shall say good night till it be morrow.
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V2
Jan 21, 2014 20:54:00 GMT
Post by ejparrott on Jan 21, 2014 20:54:00 GMT
Strange...I can't say I've ever experienced any issue with 316 work hardening to that extent before
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jma1009
Elder Statesman
Posts: 5,901
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V2
Jan 21, 2014 22:12:12 GMT
Post by jma1009 on Jan 21, 2014 22:12:12 GMT
Sorry but this just HAD to be posted}------------ Parting is such sweet sorrow alan, your endless wit is wasted on this forum... you should have gone on the stage! cheers, julian
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Jan 21, 2014 22:37:13 GMT
Post by Deleted on Jan 21, 2014 22:37:13 GMT
I know, I know------------ Wells Fargo...There's one leaving right now !! LoL !!
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Jan 30, 2014 19:53:14 GMT
Post by fostergp6nhp on Jan 30, 2014 19:53:14 GMT
I would say the dig in was not helped by the short grip in a 3(ugh) jaw chuck.
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V2
Jan 31, 2014 18:16:56 GMT
Post by Deleted on Jan 31, 2014 18:16:56 GMT
Worked fine in the 3 jaw this time with a lovely tipped parting tool at low speed having nipped the gib strips to take out some of the slop. Happy days! ---------------------------------- so maybe this is now appropriate ?? }------------- www.youtube.com/watch?v=oo__EIXzAco ------------
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Feb 10, 2014 12:56:06 GMT
Post by ejparrott on Feb 10, 2014 12:56:06 GMT
Nice work
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Feb 13, 2014 18:23:24 GMT
Post by Deleted on Feb 13, 2014 18:23:24 GMT
Nice and neat work Ben.. she's going to be a fine loco if you keep this up..
Pete
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