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15th September 2011, 12:29 PM #1SENIOR MEMBER
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HSS tool reccomendations for boring job
Hi guys,
I have a job that I need to do which is as follows. I need to bore a 28mm diameter hole 8mm deep into a 10mm thick piece of aluminium. the 28mm needs to be precise enough to house the outer diameter of a ball bearing (The inner race of which will be an interference fit onto a shaft). See attached highly technical drawing for further information.
I am not sure if any of the carbide tools I have will be up to the job without interfering, so I thought I'd grind up a HSS tool to do this.. What sort of tool would I need to grind to do a job like this? The workpiece will be 125mm by 60mm so will most likely be held in the 4 jaw, or on the faceplate if the jaws interfere with the lathe bed (my lathe has a 250mm swing)
Brendan
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15th September 2011, 12:53 PM #2GOLD MEMBER
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Are you going to use the HSS in a boring bar or just use it in the tool post?
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15th September 2011, 12:57 PM #3SENIOR MEMBER
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Because the job is so shallow I was thinking of just using HSS in the toolpost.
I have 1/2, 3/8, 5/16, 1/4 and 3/16 HSS at my disposal.
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15th September 2011, 12:59 PM #4GOLD MEMBER
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Which piece of HSS will cover the width of the tool post and still allow for enough depth to do the job,the more tool post clamps the better.
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15th September 2011, 01:02 PM #5SENIOR MEMBER
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Either the 1/2 inch or the 3/8
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15th September 2011, 01:16 PM #6GOLD MEMBER
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Use the 3/8 it will take a little less grinding.
You may have to grind 2 cutting edges if you cant grind something that will bore/turn and face.
Unless you can find a drawing on the net of a suitable tool ground for cutting Aluminium it will be a bit awkward to describe.
You need the tool fairly sharp with a fair amount of top rake.
You will have to grind enough side rake/clearance so that the tool does not rub as it machines the bore.
Front clearance angles should be enough to give clearance so not to rub as you bore ( looking down on the tool from above you want the edge that will be cutting to just have a little,the front of the tool slightly more).
In essence you will be trepaining.
The tool will be similar to a parting tool shape.
When you come to do the finish face just grind a knife tool up,feed from the centre out,when you get to the edge just under cut it slightly so as to get rid of any square corner or radious thats not desired.
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15th September 2011, 02:05 PM #7Senior Member
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G'Day Brendan,
I regularly do a job that is similar to the one you describe, I use an 8mm SECO boring bar with a CCMT insert and slightly undercut the inner corner.
Regards,
Martin
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