Help wanted solving groove for O ring cutting on lathe

Hello

This is my first time posting here. I have a problem which I can't, for the life of me see a way around.

In a nutshell, I need to cut a 5mm groove to fit an o ring seal in to the circumference of a 190mm dia workpiece (the piece is Engineering PVC).

However, the cross-slide on the CJ0623B lathe won't swing out far enough to use a 'straight' cutting tool.

Therefore, I need a kind of right angle too. Please see the attached diagram to se the problem.

Can anyone advise what kind of tool I could purchase that might do the job, please?

Thanks

If you do a search for double ended boring bar, you will likely see images like this **LINK**

I'd probably make one something similar, but with round holes and use a bit of round tool steel rather than a square length of HSS. Use the straight rather than the angled hole.

Just grind your profile on the end; I guess an ideal candidate for the toolbit would be an old centre drill.

Welcome to the forum.

Regards

Bill

Edited By peak4 on 17/11/2016 16:33:36

Is it not possible to turn the top slide (Compound slide.) so that is pointing to the front. I.E the handle will be at the back of the lathe. you may have to remove the handle and find another way to turn it.

Les.

I have just realised I have made a wrong assumption. I was thinking that the groove was in the face of the work piece. If the groove was close to the end of the work piece you may be able to angle the top slide so that it let you get the tool tip to the larger diameter and also to the left of the cross slide to enable you to cut the groove.

Les.

A boring bar fitted to the back of the toolpost is how I would do it. One with an inserted cutter from 1/8" HSS would be ideal and easy to grind to shape.

You can do the same to skim large flywheels.

Neil

P.S. welcome to the forum.

So how does one view the attachment because i cannot see it !!!???

Like this, using a boring bar with the cross slide fully back:

Andrew

Hello all

Thanks for taking the time to reply and welcoming me to the forum.

Unfortunately, I don't think I have explained the problem well. The groove for the O Ring has to be around the outer perimeter of the circular workpiece, a little like a pulley wheel type thing. Does that make sense? Imagine two locomotive wheels stuck face to face and you get the idea? Sorry, I can't think of any other way of explaining.

I have a diagram which shows the problem perfectly, but for the life of me, I cannot find a way to post it. I click on the image icon and it asks me for a URL which I don't have as it's on my desktop not in photo bucket or similar. Ditto when I click on the camera.

Any advice on how to post the image would also be most gratefully received.

PS: I am female

Sounds like a hook tool is required.

Regards Ian.

http://s304.photobucket.com/user/christineanniewalker/media/OringLathe_zpsyah4beh7.jpg.html

This may work

Easiest way is to put the image up in Photobucket or similar. It's free and easy. Then when you click the image icon on here, copy and paste the "DIRECT" link in where it says URL.

Done that but just get a question mark? See if this works

Hi Christine

Simplest way to upload a pic is save your sketch/drawing as a jpeg file, you can then upload it to an Album.

Do this from the top line Menu, click on Albums and follow hints, when writing your message click on the camera "Insert image from Album" and follow menu.

Emgee

Here you go

No need for special tools or counter-rotation. A common boring bar will do the job. One with a removeable HSS bit will allow you to grind it to a nice square profile to make the shape groove you show.

For those that can't see the pictures. I assume it is this way for most, they don't appear in email notifications, you have to use the forum (not necessary to log in).

It's in photobucket now. However, when I copy the URL and try and put it in this forum's uploader, it just tells me the image source is missing. Never experienced this before.

Thank you Hopper.

YOu would need a boring bar like this one, with a piece of HSS in the square hole at the lefthand end.

I's sure ArcEurotrade or other advertisers from this site can supply such a beast. You can get them do hold different sizes of HSS square bits, depending on what size groove you wish to turn.

Edited By Hopper on 18/11/2016 10:00:27