The Shop > Tools
lathe tool post advice
Jonny:
Previous lathe I used to gang up the cutters in several 4 way and boring bar type tool posts but did away with the 90 degree indexing. Harrison fitting on T slot, just slacken off and slide the lot out for the quick change type on its own T slot slab.
Liked it that much milled the M300 the same and done away with the 90 degree indexing. Sold the Dickson that bought 6 cheap 250 series holders.
PekkaNF:
--- Quote from: Andrew Wildman on October 06, 2015, 01:45:41 PM ---.....
It was the right size for the centre height but the tools would have to hung out quite a way to clear the top slide.
--- End quote ---
My Chinese lathe had really bad topslide, I removed it and replaced with a 20 or 25 mm square spacer , where I drilled and tapped two M16 or whatever that central post bolt is holes. The holes were spaced only about 20-30 mm away from each others, but designed that way that:
* Tool tip will be placed stable side of the lathe guideways, no cantilever load on cross slide front shear
* AND with a conservative tool shank overhang big piece would clear the topslide and make it possible to turn just a little part that does not go over the cross slide, but you can get close to it. My lathe has central height of 125 mm or so, this is limitting factor many times.
* Possible to use limited travel of the cross slide to do some right/left hand boring/threading + do all external turning on one setup
* possible to turn the TP "ways" outside (towards you) and do a little oversize turning near the chuck. Handy if you have one big lefthand facing tool - it's used here as plain turning tool and right hand facing.
It's funny how much even 10 mm move on tool post central bolt has influence on how close you can get. This was very important, because I traded rigidy over top slide, but I can imagine that it does not hurt to do a little dry run with a few favorite tools on the TP before mounting it permanently.
Pekka
Jonny:
They do vary quite a lot Pekka, current M300 has far less cross travel than the old 140 probably around 2", so much so have to slide tool post across in T slot for knurling and boring when i put an angle on the cutter.
Weirdly the M300 gone the other way over previous lathes, even minimal overhang its a rarity top slide will foul tail stock or even a large J&S revolving centre.
Andrew Wildman:
Tool post arrived and it looks like it will fit well. Just got to make a nut and/ or stud to fit the l5. Update coming.....
Jonny:
It will fit but too small, even these were small used for 10 yrs http://www.arceurotrade.co.uk/imagecache/bf7b8c8b-20ae-4fd4-8170-a34900ede141_700x323.jpg
http://pic20.picturetrail.com/VOL15/728921/1252422/311844089.jpg
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