Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Katoh on June 09, 2011, 09:57:20 PM
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Colleges
I am starting my second adventure now of building a CNC Metal lathe, I will post adventures of that as they start to unfold.
At the moment I have a question to all the lathe workers out there regarding tooling. I purchased a 11x30 machine 1hp quite modest, and a little on the light side. The machine is manual operated and slowly as I make parts I will covert to NC.
I have been told and have read, that lathes such as mine will operate nicely with positive rake tooling, my dilemma or my question is can you use a tool holder with negative rake position with say a positive rake tool insert?
Seems like all the decent stuff or decently priced holders are all negative rake in the 1/2" 12mm size. I have found some holders I like that are 5Deg. neg but if I use a 7deg positive insert wont that now become 2deg positive? Or am I looking down the barrel of a whole heap of pain.
Please don't come back with with I should use HSS, I don't wont to go there at present, maybe a couple of years down the track from now. Tooling will be all holders and carbide inserts for now.
Thanks
Katoh
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This will depend a lot on what material you want to work with.
Positive insert will work well with light pass and negative will be used on more heavy pass.
On most light duty lathe, positive tooling will work better for me.
About negative holder with positive inserts, no problem with me.
The more important thing if to be sure that the tip of the insert is centered on the part, a bit higher and it will break very fast.
Jeff
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Thanks Jeff
Good info, at the moment my first job when I get setup is some aluminium, need to make some parts for a boat I'm building.
Does anyone use Glanze tools? Any Good, or they just named no-named bits. IE you pay extra for the writing on the side.
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Have a small boring bar from Glanze (Chronos) and it is quite nice.
Hood
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I buy 95% of my tooling from Ebay, Very often, you can fing great deal.
Jeff
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Gentlemen
Thank you for your comments, they have been very helpful in making my decision.
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Does anyone use Glanze tools?
The Glanze holders are very nice, and very well priced. The standard inserts supplied are poor and chip easily. Buy brand name inserts from the 'bay and you will be fine. If you are in UK, Cutwell Tools sell very good Korloy (South Korea) inserts that are meant for aluminium (http://www.cutweltools.co.uk/files/ww/ccmt%20&%20ccgt%20inserts.pdf). The CCGT 060202AK (razor sharp) are fantastic for aluminium, plastic, wood, etc.; this type is hard to find in auctions. Their CCMT060204-HMP are good for everything else - these ones are much more common.
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Cutwel also often have offers on, heres one from the latest flyer I have, any four tools for £100 plus VAT which is not bad, also free postage.
Hood
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That is some mighty fine information djc, and I'm really looking into spending some coin there to set up all my tooling. I'm a long way off from the UK like half a world Away. actually in Aus to be specific. I was reading the thread written by jrslick22
http://www.machsupport.com/forum/index.php/topic,16443.0.html
were he has converted the same lathe but not used any 12mm tooling, brings me to a question crossroad. Do we buy the tooling as good as it is, and will it be able to cope Ok under NC circumstances or do we look for bigger and better?
Again I don't know much about lathe work, but presume 12mm tooling will be fine under CNC conditions
Hood Ill check them out too. I worked out I'm going to spend around 180pounds but don't have to pay vat, but will pay freight.
Cheers
Katoh
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Never used smaller than 20mm but no reason the smaller stuff wont be as good on a smaller machine, after all sliding head type lathes often use tiny tools and take massive cuts.
Hood
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HOOD
Ill take your word, I'm a wood worker branching into a new horizon, If it wasn't for that boat I'm building I wouldn't off even bothered to buy a lathe, but after building a cnc router do you think I'm going to leave this a manual machine (NO CHANCE)
I look to people like you for advice, with the experience and no gobbly gook to go with it.
Mind you I have one hell of a wood lathe that's not covered yet? Does that make me a hypocrite?
Cheers
Katoh
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Ha ha not a fan of wood, I leave that to the Boatbuilders that are above my workshop (or their office is anyway ;D )
I offered to make them a big lathe to turn masts on but they are stuck in the past and would rather have two men working away with electric planers hand working them ;D
Hood
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This just gets better, I don't build in timber but aluminium, models of the boats are in timber. You have to love CNC.
Here's(http://) a quick pick of my backyard at the moment, Gets scary at times.
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Ha ha hope it doesnt keel over that far when you launch.
Built a wee chain ferry from Alu but most of the Alu I do is structures on the fishing boats themselves, hoppers, net drums etc but the majority of my work is 316 stainless.
Heres a pic of the back of my workshop a year or two back
http://www.machsupport.com/forum/index.php/topic,11249.0.html
Hood
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Holy crap that's much more impressive than mine! Do you think were Related?
Good chatting with you again, its bought a smile to my face. I will go back to my tooling subject now as once I get started on boating that will be the end of the post.
Cheers
Katoh
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I just did the stainless on it, the rest is GRP
Another place to look for tools is J and L, they sometimes have specials but unless they do they are not that cheap.
Hood
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Do we buy the tooling as good as it is, and will it be able to cope Ok under NC circumstances or do we look for bigger and better?
Again I don't know much about lathe work, but presume 12mm tooling will be fine under CNC conditions
12mm will be OK. The beauty of CNC is that it is easy to take lots of shallow, fast cuts as opposed to a deep, slow roughing cut.
If you don't already have a QC toolpost, you will want to buy one; smaller sizes are cheaper. Also, sooner or later you will want to add a toolchanger/turret; again easier to make for smaller tools.
If you do end up buying Glanze (Chronos in UK), consider getting the screwcutting set at the same time to save shipping. The Glanze set includes two tools that let you use the normally unused edges of the insert, so you get four edges per insert instead of two. Also, have a look at CTC Tools. I believe they sell the holders that take CCMT inserts. I have heard that their shipping is good to Aus.
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Thanks Hood Ill have a look at what they have on other through the week.
djc my list that I put together or wish list had the internal and external threading tool in there, also a parting tool . Boring and facing tool both use the CCMT and they have a left and right pair DCMT good for profiles, The other I had on the list was round profiling tool, really when think thats 8 tools for about $290Aus seems pretty good to me.
I will look at CTC as well.