Turcite vs Moglice vs Delrin

This one does.

OK, I realise you probably meant current CNC machines, & this one is neither current nor CNC. I just thought I would throw it in to be mischievous. In fact it may well predate Turcite, Moglice etc., I don't know when they became readily available?

Cheers Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Just to throw another oar in the water here.

I have had two personal experiences where the ball bushings were replaced by the plastic lined bushings from RS and worked better. Both were low force applications and both had problems with fine dust.

One was on the Y axis of a laser cutter and the fine dust and fumes caused the ball bushing to tighten up in service. Once on a service call we couldn't get any new bushings locally in time and replaced them temporary with some RS lined bushes whilst spares were ordered. They never got fitted as the lined bushes wiped the shaft clean and it ran until it was scrapped a few years later.

Because of this experience I swapped the ball bushing on a CNC router for lined bushings as the MDF dust was having the same problem and again it cured the problem.

With better designed seals and covered bellows on the way the ball bushings may have been no problem but with the skeletal build up of both these machines the lined bushes cured what problems we had.

.

-- Regards,

John Stevenson Nottingham, England.

Visit the new Model Engineering adverts page at:-

For the benefit of the terminally bewildered - would somebody kindly tell me (and the majority of the other silent witnesses) what DU stands for! --

Chris Edwards (in deepest Dorset) "....there *must* be an easier way!"

Depleted Uranium......

.

-- Regards,

John Stevenson Nottingham, England.

Visit the new Model Engineering adverts page at:-

Get on with your work! --

Chris Edwards (in deepest Dorset) "....there *must* be an easier way!"

I have to correct you. Industrial lathes with round linear ways do exist. *Big* round tubes with hydrostatic bearing (no DUs). Can't remember a name now.

Nick

Hehe.. Yes not CNC. I've seen an used a fair few Ward Capstans. But what the hell is that thing? I'm intrigued. Looks more like a t&c grinder?.

Yes Tom I saw that. But having been around a lot of people doing homebrew retrofits as has J.S. I have seen so many start off saying "I only need this" But later wish they had made the machine to be capable of doing "That" !

Same with the size issue!

Sadly reading through the posts on some of the CNC forums, there is quite a lot of frustration. Most of which could of been avoided with a little time spent earlier on planning the thing out.

Wayne..

Yes a problem with round linear rod is that need to support it, and therefore the slot required through the bearing to clear the supports.

It is one of the reasons I dislike them. The longer the travel you need the worse the problem seems to get. As well as their need to be elevated over any solid base.

Those NSk(etc) linear rails at least can be bolted down onto a flat surface. I do realise there's a cost issue with those though ;) There are bargains to be had if you look hard enough.

Wayne...

I bought a small quantity of SKC 400 ELF from a local company here in Sale a while back - its a PTFE filled castable epoxy. Planned to use it to re-do my lTaig mill feednuts till I discovered that the backlash was bearing end-play and crappy couplers - see my article in latest MEW.

So, its still in its tin waiting for an excuse to use it on something

- I'm sure I will find a use for it at some point!

SKC's website:

UK dealer details:

M. Buttkereit Ltd. Unit 2, Britannia Road Sale, Cheshire M33 2AD

Tel. +44 (0) 161 9695418 Fax +44 (0) 161 9695419

snipped-for-privacy@buttkereit.co.uk

Regards, Tony

Yes it is a controlled spiral cutter grinder, will grind spiral flutes without the use of guide fingers as well as all the usual T&C functions. Made by Ward Grinders in Dorset, spiral grinders were their speciality. No connection AFAIAA with the other lot.

Cheers Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Tony, Many thanks from the once capital of the innovative industry.

Any chance that you could squeeze a bit down line as I am farting about with the feed nuts on a Super7B which had a gear box full of mahogany dust on purchase? The rest is quite unprintable.

Again, my thanks- meanwhile, back to the shed!

Norman

Just get a new pair from Myfords, they're not expensive.

Mark Rand RTFM

Tim

I actually thought after I posted that maybe it was a product of Ward Grinders in Parkstone, Poole. I have quite a few friends in the business who served their time there. Maybe some of them worked on your machine.

Long gone now I think.

Wayne...

Its not a terribly divisible product unfortunately - it comes in a tin with a separate bottle of hardener so its a bit of an all or nothing job - and for what I paid for this lot (about 50 squid when you add all the release agent paraphenalia, cartridges so that you can inject the stuff, VAT, etc. etc.) you could probably get some shiny new nuts from Myfraud & still have change for a couple of pints to wash the mahogany dust out of your system.

Regards, Tony

The feed nuts are only the first part. I am now setting up dial assemblies which are somewhat( geez) worn. And then there are the gibs which will go onto the little Clarkson and so ad infinitum.And then there is this Cervantes fellow who wrote " Patience, fleas, the night is long" if you know what I mean.

Like the old maxim about having a spare clip of ammo.- Prediction is very difficult especially about the future.

Thanks again

Norm

Nick.. You didn't see my disclaimer ;) "machines that I know of" I have used lathes with nsk style linear rails though. Two machines come to mind, both Mazaks (quickturn 10 and a 15)

Both replaced old flatbed Hardinges. When it came to turning 316 stainless they effectively were slower than the 1979 and 1982 machines they replaced. The 15 had live tooling in the turret too, the rigidity so so poor it sometimes struggled to mill 6082 alloy. Those were very expensive machines too. ALl they were really good for was high speed rapids.

You can't beat IRON and lots of it! The reason I seem to collect Hardinges ;)

If they really have as you say "tubes" thats even worse, unless they are filled with some very high density material. Hate to think about the resonance problems.

Wayne..

I thought you know them all. ;-)

No, I thought that round beds are crap. Maybe they are. Now the name came back and I can give you a link. So you can judge by yourself. At least, it is interesting. Can't say wether it really works!

Yes, mass is always good. No doubt.

Nick

Sorry, we have that in English too!

Nick