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Member postings for Peter Spink

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

Thread: What Did You Do Today 2020
06/06/2020 23:13:41
Posted by Colin Heseltine on 06/06/2020 20:36:57:

Peter,

Yes I did 3D print them. Found lots on Thingiverse and other odd sites but nothing that would suit my requirements. I then found a file someone had created with OpenSCAD which is parameter driven. I was able to alter length and all the sizes of the electrical connection box and lid. Worked brilliantly.
Colin

Excellent, ta yes

06/06/2020 20:21:15

Thanks John,

Been umming and ahhing about buying a 3D printer - maybe the time has come!

06/06/2020 18:54:36

Good work Colin!

On my rotary table I found the worm engagement critical to prevent the stepper stalling but once set it's fine.

Did you 3D print the stepper motor termination boxes or is someone selling them?

Could use a couple if so.

Thread: Soldering Iron
03/06/2020 23:06:31

For electronic work Weller was always the favourite make but a bit pricey.

I've had one of these LINK for some time - been very pleased with it and a reasonable price.

Ergonomically poor for me but easy to split the units up and have the stand seperate on the left (with a weighted base) and the power unit to the right.

Thread: What Did You Do Today 2020
17/05/2020 20:00:40

First time machining cams and something I'd not been looking forward to.
Boring head and rotary table seemed like the best approach for me but problem was lack of headroom on the mill so had to machine up cam blanks to fit directly into the table.

Waste of metal for such small parts but once set up a very easy process and pleased with the end result!

Cam set up1.jpeg

Cam set up 2.jpeg

Cam 5.jpeg

Ready for parting off and finishing.

Thread: Carbide Insert Designations & Suppliers
11/05/2020 08:23:20
Posted by JasonB on 11/05/2020 07:00:12:
 

Michael, no, the lines are what the stepover leaves at the edge of the diameter of the cut so size of tool would not matter. Totally impractical but would give straight marks on the surface.

Peter, those plain shank flycutters are usually 1/2" or 12mm shank so that tool looks to be 6mm sq

John, how do you get on with aright hand tool when I put one in my flycutter it would need to run in reverse and it also puts the insert off of the radial line so you end up with negative rake.

Left

Jason thanks for pointing that out - my flycutter takes 1/4" square toolbits (slot is about 8mm) so I would need a 6mm toolholder and shim it to get the cutting edge on the centre line. I don't think the CCGT button inserts are robust enough generally for interrupted cuts but maybe OK for a very fine finishing cut on Ally?

Edited By JasonB on 11/05/2020 10:01:29

10/05/2020 23:09:29
Posted by John Hinkley on 10/05/2020 21:35:06:

Peter,

JB Cutting tools do a "button" insert holder in 8mm. It uses an 8mm diameter insert. If you want a larger radius, you'd have to get a larger tool and grind it down. Or a carbide end mill might do the trick, too.

JB tool 8mm shank

By the by, I bought a box of 10 CCGT polished inserts at last year's Doncaster show (from the JB stand) ostensibly for machining aluminium, but just lately I've been using them more and more on steel. Once I got the speeds (high) and feeds (low for my lathe),right, the finish was really good. Incidentally, I use a righthand insert tool in my flycutter with good results. Not that I use it very often.

John

Perfect John,

Many thanks

Peter

10/05/2020 19:37:20
Posted by magpie on 10/05/2020 10:04:40:

My fly cutter. I get a really great finish with this one. 100_0823 (small).jpg

Is that an 8mm square shank?
Been looking for one just like that so could fit my present flycutters.

May I ask where from?

Edited By Peter Spink on 10/05/2020 19:38:23

Thread: Boring vs Reaming
08/05/2020 21:34:37

Bore it!

Turn up a go-no gauge as in the book and you'll be fine.

Made mine probably twenty+ years ago an it's one of the most used tools in the workshop, mainly for tapping.

The original GHT handle was not at all user friendly so I made up my own.

Forget the sensitive drilling attachment as more modern alternatives available now.

UPT

UPT

For tiny taps the original Eclipse chuck works well.

For bigger taps, an ER11 collet chuck which can pass through the arm with the nut removed.

For even bigger taps a Jacobs chuck with a bayonet to disconnect the handle so it will pass through the arm.

Thread: 3D Printed Newtonian Telescope
03/05/2020 08:07:26

Wow that's a super job!

+1 for details of your printer and set up please smiley

Thread: What Did You Do Today 2020
25/04/2020 20:32:40

Hi Joe,

Not using Mach 3 to control the machine at all. Just using it with the camera software plug in!

As I said I've just noticed the camera software is available as a stand alone so will check it out.

Peter

25/04/2020 20:05:06

Hi Martin,

This: LINK is the bore scope.

And this is the business end as installed.

Business end

This bore scope may not be the best to use in this instance as the last 1M cable at the camera end is semi rigid - a more flexible lead may be preferable but I had this to hand.
However, the advantage of this particular one is that the camera and leds are in a metal tube about 30mm long which the M3 grub screws bear on, giving a tight grip on the camera end. (Right angle mirror supplied just unscrews)

There are lots of these cameras around so maybe other options to experiment with but not sure whether they have metal tubes around the camera rather than plastic which wouldn't be so good for the grub screws to bear on.


Just noticed that the software is available as a stand alone so doesn't need Mach 3 installed - will check that out tomorrow.

Rgds, Peter

24/04/2020 20:50:43

I've been using a USB 'Centrecam' with software by Mike Tretheway for some years now and it's been invaluable but unsupported for some time. Unfortunately it failed recently and having faffed around trying to fix it I decided it was time for a rethink.

I was given, as an xmas present, a rifle borescope, 5.5mm dia with built in leds so decided to see if I could adapt it to replace the Centrecam.

Ally housing machined up with M3 adjustment screws and fitted to original MT2 taper.

New centrecam

New centrecam 2

Screenshot  2

Downloaded and installed demo Mach 3 software and camera plug in LINK

Very pleased with the results - much smaller and easier to align with the centre of the quill and added bonus of a microscope able to look at the state of tool tips as shown surprise

Tooltip

Thread: Ace Myford S. 7 mod
19/04/2020 19:38:34

Cleaning? laughangel 2

Thread: It would happen now!
15/04/2020 14:15:47
Posted by Neil Wyatt on 15/04/2020 12:24:21:
Posted by Clive Hartland on 14/04/2020 15:44:45:

Thank youm gentlemen, all good info. spent an hour talking to an engineer from Swale gas based near me in Sittingbourne. Quite busy around this area.

End result is a quote of £2788 to do the fitting of a wall mounted boiler, a WorcesterGreenstar.18R1 A rated boiler plus pipe work and flue connection.

They will look at the Gledhill hot tank and if necessary repair it.

I am happy with that quote so will tell them to go ahead soonest.

PS, if hot tank no good then another quote! All within 48 hrs.

Clive

Sounds a lot to fit a £900 boiler, and you definitely don't need a that water tank with a combi boiler. The greenstar will give you hot water at a higher pressure and faster rate than most tanks.

Greenstar 18Ri is a system boiler not a combi smiley

I would say installation cost is ballpark depending on which part of the country (!)

14/04/2020 11:06:55
Posted by Clive Hartland on 14/04/2020 07:16:12:

I woke up last saturday to find that my boiler had failed, so with help from my Son we had a Plumber look at it.

'Kaput', he says, obsolete and no spares available, looks at hot tank and says it is leaking. Also there is a perforation of the flue just an inch or so from the boiler.

It is all switched off now.

This system is a Kingfisher boiler and a Gledhill tank system and quite efficient and is only the second breakdown in 20 years.

Give me a quote:- Oh yes, thank you Sir. Comes the quote £5750, two men over 3 days. New boiler and a pressure tank.

Running on the immersion heater at the moment at about £5.00 daily. but I am usng no gas so that should even out.

Does sound like a lot but without more info it's difficult to give a definitive answer.

Just a few of the questions to ask.

Does that include powerflushing? (Essential for manufacturers guarantee)

Gas supply adequate for new boiler?

Flue in same place or need re-routing?

Position of flue discharge and plume management?

Somewhere for condensate to drain?

TRVs to be fitted to radiators?

A decent boiler (Vaillant, Worcester IMHO) will set you back about £1K plus flue and bits. The installation will have to comply with regs so a simple replacement thermostat will not comply.

Thread: ARC Digital scales converted to mains power.
10/04/2020 21:10:02

Surprised - current draw in these scales is tiny and batteries usually last for ages.

Have you put in a new battery? Maybe original was duff.

Thread: What Did You Do Today 2020
29/03/2020 12:27:04

Crankcase 1.jpeg

Plenty of time on my hands self isolating in the workshop so making progress with the bottom end of the Lynx smiley

Thread: Vickers Bl 8 inch Howitzer cannon of 1917
21/03/2020 23:00:36

Crikey, great work!

I'm genuinely amazed by the quality of work by people on this forum - truly inspirational yes

Thread: vfd question
21/03/2020 10:17:51

Is this: LINK the one?

Testing the earth continuity at 04.17 it appears that the earth is also switched via the locking pushbutton disgust
Not a good idea!

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