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Member postings for David Colwill

Here is a list of all the postings David Colwill has made in our forums. Click on a thread name to jump to the thread.

Thread: Seeking advice on suitable lathe
09/09/2019 10:02:36

If you do go down the route of a lathe perhaps look out for an EW lathe. Details can be found on

These are small but have back gear and while you won't get anything of note through the spindle it would at least have some torque at low speed.

Instead of drilling and boring out consider using an annular cutter or rotabroach. These will leave a slug of metal from the centre thus saving work.

If you are anywhere near Nottingham I do have both an EW and a set of rotabroaches that you can look at / play with.



Thread: Any one used a digital microscope for micro turning on a lathe
06/09/2019 10:27:43

I haven't been too impressed with the digital microscopes that I have (and I have 3 or 4 of them). I am considering one of the Chinese stereo zoom microscopes and had thought of making some kind of quick change mounting so that I could move it about.



Thread: Any one recommend a supplier of 1/4 inch lathe blanks
24/08/2019 07:51:58

MSC J&L have them on offer at the moment (till end of August) The 10% cobalt are £2.52 plus vat etc.



Thread: Wasp trap - suggestions please
19/08/2019 14:13:55

Obviously this needs to scan on a pan tilt mount and be able to track the wasp!



19/08/2019 14:12:18

I'm Thinking some kind of hi res camera with optical recognition software linked to a 30 watt laser!

Thread: Guess the Chemical?
28/07/2019 10:13:55

SECTION 5: Firefighting measures
5.1 Extinguishing media
Suitable extinguishing media
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
5.2 Special hazards arising from the substance or mixture
No data available
5.3 Advice for firefighters
Wear self-contained breathing apparatus for firefighting if necessary.

I had thought water but had ruled it out due to the above!



Thread: What lathes have you had?
23/07/2019 07:28:33

blush The list is way too long! Even if I limited it to the ones I still own.



Thread: Cruise meeting crash
19/07/2019 10:45:03

I'm sure that people will be charged and I would guess that the punishment will be severe (we have to make an example don't we?)

To be honest I am not sure how I stand on this. Whilst people have been injured and this is indeed very serious, I also feel that this is an accident albeit one caused by stupidity / carelessness, it is probably safe to say that none of the parties involved intended this.

If I look back through my life and think of all the stupid things that I have done and gotten away with, it makes me realise how lucky I am to still be here not to mention not in prison. I have certainly on more than 1 occasion driven at more than 60 in a 30 limit (a long time ago!)

The irony of course is that the people owning and driving these cars are in many ways like the people ion this forum. They will be familiar with many of the things we have and use in our workshops and would no doubt be applying many of the skills we use.

It is more a shame that there is no better and safer space available.



Thread: Barrier Cream
16/07/2019 08:15:10

I have never bothered with anything like that until I recently changed to using neat cutting oil. Suddenly cuts seemed to become infected and my skin was irritable.

I went for Rozalex Dri Guard and also bought disposable gloves and after a short time getting used to using them I have noticed a big difference.

I may try Tough Hands next as having only used one product I have nothing to compare to.

It was certainly a worthwhile change to make.



Thread: Microns ...
05/07/2019 09:29:37

Sorry I have just sneezed and it seems to have jumped out of tolerance and floated out into the garden.


05/07/2019 09:28:20

That all seems a bit agricultural to me.

I have just made a bolt for my 1 5000 scale engine that I am building on my 1902 Drummond lathe.

The bolt measures 57 nanometers in diameter and is accurate to 5 picons (can I call them that?)

I am happy to send it for inspection.



Thread: Scraping
25/06/2019 08:24:43

BTW his channel is excellent!



25/06/2019 08:23:37

As already mentioned there is much to learn on youtube.

Here is a good place to start

Thread: Does Not Compute
02/06/2019 08:46:35

I tried clicking the link but it doesn't work smile p

Thread: Stepper rating for Triac upgrade?
01/06/2019 08:07:20


I did mine years ago. I can't remember what specs mine were but since a 12nm is raising the knee of my bridgeport clone I can't see you having any trouble at all with the motors you have suggested. I don't see any point in spending the extra money on servos unless you want to terrify yourself watching the thing fly around in a blur.

Does your triac have the tool changer?



Thread: Denford Triac - Remove Easy Change Holder?
27/05/2019 17:57:35


I had a triac with the r8 taper and the easychange holder does come out as you suspect..



Thread: Lifting and moving a Downham Jig Borer
23/05/2019 06:08:35

Whereabouts are you?

Thread: Parkson M1250 Beast
15/05/2019 06:59:18

It should keep the workshop door from blowing shut! smile p


Thread: Not quite a lathe, but what is it?
15/05/2019 06:57:44

I'm not sure either but I have a strange desire to buy it.

This must be some kind of as yet unclassified mental illness and I suspect there are others on this forum that suffer from it.

Do you have piles of random junk scattered here there and everywhere?

Perhaps we could form some kind of self help group.


Thread: Smart and brown lathe
15/04/2019 09:10:07

I have a 1024 smile p

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