Thread: Newbie with lathe questions

1 is R/H,use it for Roughing,no good for turning to a shoulder unless you Offset your tool post.

2 appears to be R/H Rough or Finish.

3 R/H Rougher,Chamfer tool should be able to get R/L chamfers.

4 Plunge Tool,you could Offset it to do Chamfers as well as Faceing,Ive never really seen them used for much else.

5 Faceing or Turning R/H.

You can also face with your R/H turning tool and back face with the L/H tool.

Have you got a Boring bar or not?

Are these the only tools you have to do the job at hand?

Are you able to Grind the Carbide tools?

What shank size are the Tools and what are the widths of the Tools from the cutting edge to the rear of the tool (the edge that will sit in your toolpost)?

I also have two boring bars and internal and external threading tools.

These are all the tools I have at hand for this job.

Can the facing tool cut on 'both sides' of it's face? On close inspection it seems to have relief on both edges, which makes me think I could start with the facing tool inside the 13mm hole (which I'm going to drill), then face outwards until I reach the 28mm line, then start cutting on the 'other edge' of the facing tool and move it parallel to the ways outwards to cut the recess? If you see what I mean...

These are 10mm tools, not sure about the dimensions as I'm at work. I have a range of grinding stones, don't know if they'll work on the carbide tips or not.

What's the difference between a finishing tool and a roughing tool? I'm struggling to get a good finish - sometimes it works, sometimes not. It often seems deeper cuts give a better finish at the moment

You would be far better off getting some HSS blanks and grinding a small boring bar.

If you are going to use the Tooling that you have you will have to Grind clearances on the Steel shank of the tools to allow you to be able to face and turn the ID.

If you dont provide enough clearance the Tools will rub.

To give you a guide as to how much clearance to give have a look at the shape of the Boring and internal Threading tools.

You will also have to rotate your toolpost to enable the tools to work for you.

I would not be coming out to your finished diameter untill you are at the final depth.

You may even find that you will end up going deeper than 9mm and you will then have to face to length(it would be easier I think if you allowed for facing to length after boring to size).

As to tools to use I would be selecting the Facing,Tool 1,Tool 2 and one of your boring bars.

My description for the opperations will more than likely be different from others,at least you will get an idea and be able to give it some thought.

I would use your Tool 2 first,bring it in to touch the face of the job,set your dials to zero,take it across to your drilled hole,advance the tool into the drilled hole(depending on the power of your machine would dictate the depth of cut).

Lets say your in .5 to 1mm,now face out towards the OD stopping when you reach a diameter less than 28mm (26 to 27mm).

If by some chance you havent got the clearance for Tool 2 at the front of the tool for this you might have to use Tool 1.

If everything is ok continue with this method untill you get down to your 9mm depth.

You could now start to do your finish ID,you could use the Facing tool or Boring bar.

You can Face with the Boring bar.

Both of these Tools provided they have enough clearance not to rub will do your finish bore and internal face.

Once you have taken your measurements for the bore bring either of the tools into touch the ID advance for the DOC and move toward the internal face,let them touch the internal face,(you have the choice at this time to either face that internal face now or after your final ID size).

(It wont matter if either of the tools rear part of there shanks go beyond centre as it will only be the cutting edge of the tool in contact with the job (as long as you have given them clearance).

Now repeat the boring opperation untill at the desired size.

After you have reach the correct ID and taken you final internal facing cut you can now use which ever one you like to face the job to length.

In regards to the Finish of your work it depends on numerous different things,material,feed rate ,speed,rigidity,coolant depth of cut.

You should be able to use your boring bar if it can only go in a 16 mm hole you just take your first cut big enough so that the side of the tool doesnt rub against the side you arent cutting, you might have to hand feed it for the first cut if it is to big for your lathe but it will only have to be abit over 1.5 mm cut since you have a 13mm hole to start with.