Member postings for David Standing 1

Just bought myself a Lotus Exige Sport 420 Final Edition, so yes, very much still enjoy driving!

Crikey, I had better get mine advertised for sale then, it will be a lot less than that!

Whatever material you settle on, don't try copper yet, unless you have experience of machining cheddar cheese!

Did you use the toolslide to turn it?

If so, very quick check:

Turn it again, using the toolslide, check result.

Then again turn it in the same way, but lock the toolslide, and use the saddle to advance the cut.

Check both results and compare.

As it is happening over such a short length, my guess would be the toolslide gibs.

As soon as that was mentioned I thought of John too!

This then suggests to me, as stated in my previous post, a careful check for damage, or foreign objects such as swarf, inside the spindle taper.

There may be no runout on the taper at the spindle nose, but an issue inside the spindle nose taper.

Given that it is hardened, it would be difficult to damage the spindle internal taper, but very easy to get swarf, for example, inside it.

Also, has anything been done to the lathe leading up to the issues you report - has it been moved, dismantled in any way disturbing the spindle, etc?

If the spindle taper is clean and undamaged, and you carry out a bearing check as suggested by Hopper, then I suggest there is no issue as such, other than age of the lathe, and tolerance in chucks etc.

Minimum projection of collet chucks and work beyond the nose/chuck is important, as these will only amplify any runout.

That didn't appear to be a test bar in the chuck, but a piece of mild steel round bar, which could be like a banana.

Have you checked runout on the inside of the spindle? All of your videos check runout with something attached to the spindle. Is the morse taper on the inside of the spindle scrupulously clean, and undamaged?

Have you checked runout with a decent ground MT test bar in the spindle?

Nor me. If I wanted to read articles about rebuilding cars, I would buy 'Practical Classics' or something like that.

As the magazine title is 'Model Engineers' Workshop', I would prefer to read articles more linked to model engineers' workshops

Likewise Dave

To insert jaws of a self centring chuck, this is an easy way.

All jaws should be removed.

Go to empty jaw slot 1. Turn the key until you see the start of the scroll thread cross the slot.

Back off slightly, push jaw 1 in, lightly hold it in, turn the key and engage the scroll thread in jaw 1. As soon as it engages, stop, go to empty slot 2.

Repeat jaw 1 instructions for jaw 2 and then 3.

Edited By David Standing 1 on 27/02/2020 17:06:10

Centre height wrong?

Too much tool holder overhang?

Wrong insert tip radius?

Wrong speeds and feeds?

EDIT - hopper posted whilst I was typing! 

Edited By David Standing 1 on 23/02/2020 09:24:55

If it works and is safe it isn't bad practice

If you have the right tool tip for the circumstances there isn't a problem.

It's a time saver too!

Don't they just. What a great description

Edited By David Standing 1 on 10/02/2020 10:34:28

What am I doing in the workshop at the moment? Not a lot!

I moved house in November, no garage at the new house, my workshop contents (largely, not all of it) are currently sitting in a 20' shipping container on the drive!

Planning application currently in for a garage/carport/workshop (the workshop is 6x6 m internal), if all goes well it should be built and the workshop back up and running by around the end of July.

Very frustrating, particularly when something I want is, of course, at the back of the container, and I can't get to it!

Likewise!

I will echo Ron's comments, thank you Jason for producing the series

You will almost certainly need a C curve MCB to run it, it will probably trip out a B curve on startup.

I don't think that was the original question

Builders fizzy foam is definitely the answer!

That appears to be a Komet boring bar.

Take a look at the UJ R (RH) bars and inserts at the bottom of page 306 on the attachment:

**LINK**