Shopping List for New BUD Owner

[dazza]

Just catching up with this thread so commenting on the post from a while back. Best way I have found to get snapped centre drills out is to put a carbide milling cutter in the tailstock chuck. Cobalt will not work, needs to be carbide, just have to be canny as carbide is easily chipped, so semi lock the quill on the tailstock to try and reduce any sideways movement and keep the quill stick out as short as possible.


Regarding the discolouration of the tool, likely it is rust as they are old and were out in the damp cabin I have out the back of the workshop.

dazza, I think that book had a section on grinding tools, if not it must have been in the other one I can't find.

Just reading that page now lol.

Going to try one of these next, but id does not state the end cut and side cut angle. The book shows an end cut angle of 5º but no mention of side cut angle.

http://www.steves-workshop.co.uk/tips/toolgrinding/tool-grinding-poster.pdf

 

[dazza]

I sharpen my pencil on mine. The wheel lasts ages doing that - the pencil not so long

What i meant to say is can i used them to debur etc (seen a few grinders with stickers saying lathe tools only).

 

[Pete.]

You can grind pretty much anything. I mean I wouldn't try lead etc but you there must be a way even for that. If the wheel loads up or goes hard dress it and crack on.

 

[dazza]

You can grind pretty much anything

I have been, no aluminium though. I was under the impression that some people have a dedicated wheel for tool sharpening.

 

[Pete.]

Possibly they get fed up with dressing the wheel after someone has been doing 'something stupid' with it. People are a bit precious about their grinder wheels. Oddly enough we have a workshop full of diamond products and nobody ever bothers to dress the grinder - it's usually loaded up with aluminium or some other crap.

 

[dazza]

I will try dressing the wheels again tomorrow but the grinder was only €30 so i think some better wheels will make a difference.

 

[Pete.]

If I'm starting a new tool I usually cut the basic shape with my 5" grinder and 1mm thin disc. It gets you a shape very quickly without heating the tool much then you can go to the grinder to finish it up.

 

[dazza]

If I'm starting a new tool I usually cut the basic shape with my 5" grinder and 1mm thin disc. It gets you a shape very quickly without heating the tool much then you can go to the grinder to finish it up.

I suppose if i can make them correctly, in the future it should hopefully only be a quick sharpen.

 

[addjunkie]

Grinding tools is quite a personal thing, everybody has their preferences and does it slightly differently. The angles quoted on the link above look very precise and in a perfect world would be, but we dont live in a perfect world. So a degree here or there will make little difference to most of us.

 

[dazza]

Had another go at the thread cutting tool. Think i've put too much on it my angle finer has not arrived yet. Do i need to continue all the way to the top?

 

[Hood]

Yes the side relief needs to be right from the top.

 

[Pete.]

Looks good but you might be making the tip a bit fragile with that much relief. What you could do now is grind the rest of the way up with less angle as what you have now won't affect the working edge.

 

[dazza]

Looks good but you might be making the tip a bit fragile with that much relief. What you could do now is grind the rest of the way up with less angle as what you have now won't affect the working edge.

Didn't see this until i had already finished the relief. Its at 13º .

 

[dazza]

Had another go its about 10º now.

 

[Hood]

Well we should see some nice threads cut later today

 

[dazza]

Well we should see some nice threads cut later today

I don't think so the lathe has not arrived yet. All projects may be put on hold for a while as i may be buying a house next week. I even cancelled my ck torch order.

 

[Hood]

as i may be buying a house next week

Ha ha the lengths you will go to to get room for all your new toys

 

[addjunkie]

Buying houses is a costly buisness, thats all wasted tool funds. I suggest grinding some run of the mill cutting tools, youll need before your ready for threads.

 

[dazza]

Buying houses is a costly buisness

I'm hoping the opposite i've been paying way too much in rent for too long it been a struggle lately.

I suggest grinding some run of the mill cutting tools, youll need before your ready for threads.

Yep thats the plan also going to have a look through what hood sent and see if any can be sharpened up.

 

[Pete.]

Had another go its about 10º now.

View attachment 101621 View attachment 101622

That looks good. Don't forget to put on a nose radius/width. What it is will depend on the pitch of thread you're cutting.