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21st Jun 2021, 04:26 AM #1Member
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- May 2021
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- australia
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Carbide tool for my 9 inch lathe. A question or two.
Good morning everyone. So as per my other thread, you can see that i've been havign issues with finish ect:
I wanted to grab a carbide holder and insert tool setup to give it a try and see if it's the tool rather than anything else giving me problems.
My question is. What size bit holder do i need so that i don't need to prop it up with spacers ect: ( no height adjustments )
South bend 9 inch lathe. There are no model markings or brandings that i can see anywhere on the unit. There is something stamped into the way on the right side, but it's scratched up a bit and i cannot work it out.
Also open to suggestions and what to get as well as long as it doesn't absolutely kill the wallet :O
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21st Jun 2021, 09:10 AM #2Member: Blue and white apron brigade
- Join Date
- Feb 2006
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- Perth
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- 7,189
I don't have a lot of experience compared to others on this forum but here is my take on TC tooling for a small lathe.
I was initially hesitant to use TC inserts because a number of pundits suggested they won't work on a small lathe. Of course they won't work like they do on a big lathe where they are used to take thick cuts but they do work well enough especially cutting through anything hard. The other claim is they generate a poor finish which I have not found to be correct. My experience is that finish is as much about operator skill, setups speeds and feeds as it is about the cutter itself.
You might like to purchase only one insert holder but ideally you need a set, and a small set doesn't cost much more than one.
There are a zillion types of TC inserts available and of course they are different sizes and serve different purposes etc.
To start with it's probably better to buy a small set that includes the inserts, but you should make sure that the inserts are available to purchase separately.
If you get just one one tool then I would get the type that points the insert to the left- see pic below.
The type that points inserts to the right right is useful - I hardly ever use the type that points the insert straight ahead.
The degree of insert holder left and right tilt available varies from ~45º upwards. The main ones I use are the 45 and 60º left tilting holders
This 4piece set below costs about $30 on ebay. Do an ebay search for "12mm shank carbide turning tools" and you will be overwhelmed with choice
If you want to favour an Aussie supplier you could try Ausee Machines and tools but their smallest set is a 7 piece and that costs $140
I have tended to purchase sets at the budget end of the spectrum and have yet to be disappointed.
Some may advertise their inserts are for Al turning etc but I've found no significant difference between these and others on a small DIYers lathe where its only possible to make light cuts. I suspect there will be a bigger difference on bigger lathes used in production situations.
The set below has a 12mm shanks which will fit your tool holder and costs about $30 - I have seen similar sets for even less.
It includes a 9mm boring bar which is also handy although eventually you might like to purchase a set of these as well.
Screen Shot 2021-06-21 at 5.38.04 am.png
From a basic set like the on a there is a never ending somewhat bewildering array of sets and inserts.
Like I said above a set of boring bars is useful as the come in different diameters to fit smaller IDs, although you may just want to buy 2-3 of different sizes to suit your work.
Again iz would get these wth a set of inserts, a set of these start at around $30.
Then there are threading and parting inserts - maybe forget about these for now and concentrate on the simple cutters.
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21st Jun 2021, 10:10 AM #3Most Valued Member
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If you do an eBay search for ccmt 06 or ccmt 09 it will bring up numerous inserts of that type, it will also bring up the tool holders they fit.
From this you can choose the tool you like.
Some sellers will have the tool and inserts as a package.
The inserts have a nose radius ( you will need to search for an insert designation chart for a full description of what all the numbers and letters mean ).
For your lathe a .2 or .4 nose radius would be the maximum.
You probably won't be able to find a tool that is at your correct centre height, you will still need to use shims to get it on centre.
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21st Jun 2021, 09:56 PM #4Diamond Member
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- Aug 2019
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- Revesby - Sydney Australia
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Peter is right, shimming the tool holder will probably be necessary, although a washer under your four way tool holder is another way to go.
Most carbide holders are standard heights. HF in this diagram is typically 12mm or 16mm:
283.jpg
16mm was close to correct on my Hercus 9, but it depends on your four way tool post. Mine was stolen from a smaller Chinese lathe.
I can't remember what city you are in, but if Sydney, I can lend you some holders to try out?
Otherwise, measure with a ruler from the bottom of your current (HSS) tool holder to the cutting edge, and use that as your spec.
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23rd Jun 2021, 04:25 AM #5Member
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- May 2021
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- australia
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- 50
I got these today. Going to have a play around some HSS blanks a couple of sizes
a right handed carbide holder with the blade things to go in
and a few of the brazed carbide tipped ones.
Also a little finishing stone for HSS and a steel shimming plate.
I have a 2mm, 3mm and 4mm shimming plate along with various feeler gauge pieces to help where needed.
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