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Which boring bar to get.

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Allen Paddock07/11/2009 16:59:14
24 forum posts
Hi and thanks for reading this ,Ive now got and started using the oil  i bought .so now ive started to turn down some 2 inch alloy bar and i need to buy a boring bar and ime not sure which to buy I did actually buy some at the model show a couple or three weeks ago but like most things i buy they were wrong  for my purpose they were made of round so i could not hold them in my super 7 standard tool holder,,,So question  what is a reasonable make Square boring bar and wheres best to buy it from.And at the same time should i buy a quick change tool holder with a boat adjuster on it to save me using shims to get the tip height..
JasonB07/11/2009 17:21:36
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Why not drill a hole in a bit of square bar to suit your boring bar diameters and then saw a slit along one side. You can then hold this in any tool holder.
 
 
 
Jason
Martin W09/11/2009 14:35:53
940 forum posts
30 photos
Depending on how much you want to spend on tool holding it might be worth looking at the RDG site. They do Dixon type quick change tool holder for Myford style lathes and for about £65. For that you get the tool post, two standard tool holders to about 12mm, a boring bar holder and a parting blade holder with parting blade. This takes away the need for packing pieces used on a standard holder and allows quick changes between favourite/most commonly used tools. Height setting is dead easy and the quick change is a boon because once the height is set for a tool it repeats exactly until you change it.
 
I adapted my lathe to take one of these and haven't looked back since. Parting off steel bars of over 1 ins is easy and trouble free as are the normal turning tasks. I think that the extra mass/weight it give to the tool assembly helps to damp down any vibration/chatter.
 
Hope this helps
 
Martin
Ian S C10/11/2009 11:04:02
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7468 forum posts
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If you haven't got a big enough lump of steel to drill a hole through as Jason B suggests,you can make a little V block,and clamp down on the round bar,this is quite OK for occasional use.IAN S C
Allen Paddock10/11/2009 17:00:29
24 forum posts
OK and thanks for the replies its been 30 years since i last used a lathe so ime drawing on my internal memory banks to get me going having bought this super 7 to keep me occupied while i come up for retirement soon ,I think i will do as mentioned and get that £65 job from the tool place ,This actually came with a rear tool post and blade but when i went to part some 1 inch alloy bar the blade chattered on the alloy then slowed down the chuck so i sharpend up the thin blade but it did the same so i put it back in the cabinet.

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