Newb's first lathe, educate me - Page 2

# Thread: Newb's first lathe, educate me

1. ## Re: Newb's first lathe, educate me

I've been trying to get a 45 degree transition from cylinder to squared section, in practise for an upcoming exam (May/June). I'm really not doing very well at all!

If I square off, then try to introduce the 45 degree slope, I just ruin hours of work. I'd like to try introducing the slope between diameters, and then squaring, BUT!!

1. I'm really bad at judging the 45 degree by hand, using a graver on the T rest. Not to mention checking the slope afterwards - could be any angle for all I can tell

2. This cross slide only has markings up to 30 degrees, and in any case I've never got it to rotate even with what seem the appropriate grub screws loosened.

As the voice of experience, have you any opinion on how I can improve?

2. ## Re: Newb's first lathe, educate me

Hi Bounder,

I use layout blue, but you can use a Sharpie or Texta and colour your work piece.

45 degrees will be the (large diameter - smaller diameter)/2

Then you can scribe the distance, and know that 45 degrees will be from the edge to the scribed line, so you just need to turn a straight taper with the hand graver.

Cheers,

Dean

3. ## Re: Newb's first lathe, educate me

Originally Posted by ddkhalaji
Hi Bounder,

I use layout blue, but you can use a Sharpie or Texta and colour your work piece.

45 degrees will be the (large diameter - smaller diameter)/2

Then you can scribe the distance, and know that 45 degrees will be from the edge to the scribed line, so you just need to turn a straight taper with the hand graver.

Cheers,

Dean
Dean's got it. It's a handy thing for 45 degree angles. In the pic you can see a 45 degree transition between the 7mm and 5mm cylinders, 7-5=2 2/2=1. For the sharp point 5-0=5 5/2=2.5.

Post some clear pics of your slide top and bottom so we can figure out how to move it.

4. ## Re: Newb's first lathe, educate me

Thanks guys I really appreciate your input. I will take some photos of my slide tomorrow and hopefully have a go at this method after the weekend - I'm off for a crammer quartz servicing class, fingers crossed it goes well! I've been trying to improve my oiling following WUS advice too. This is an invaluable forum.

5. ## Re: Newb's first lathe, educate me

Sorry for the delay in getting these pictures up - I got the light tent out, as all previous attempts reflected off the metalwork terribly!

I had a quick look at the lathes while at the quartz class. The only one with a cross slide had a sort of elaborate hand pointing at the -/+ 30 demarcations.

6. ## Re: Newb's first lathe, educate me

I've never had one of those slides in my hands but I think you are on the right track. May need a whack with a soft faced mallet, probably hasn't moved in decades and oil can get pretty hard.

7. ## Re: Newb's first lathe, educate me

Thanks mailchort. I have noticed that old oil around the headstock had congealed to a sort of gum, which cleaned off fairly quickly. Dare I give it a whack! Maybe build up my courage first.

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