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Member postings for Steve Withnell

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

Thread: Electric vehicles
18/11/2020 19:32:54

Yesss Electrical near us have a free recharging point...mind you the electrician I last used on a job went to Yesss because they did free pies on a Friday

Steve

Thread: Rubber mat.
01/11/2020 16:03:31

I just use a couple of layers of carpet offcut...

Thread: .DXF Files for Meccano Chain Wheels
27/10/2020 13:31:04
Posted by JasonB on 27/10/2020 12:17:12:

I did not find it but could measure from my drawing. I drew a 0.250dia circle and made it tangental to the 0.046" one for the valley and then also made it pass through (coincident) one end of the 0.015" arc.

Edited By JasonB on 27/10/2020 12:21:12

Thank you!

27/10/2020 12:10:31

Started drawing my version - thing I can't work out is how to establish the centre for the 0.125inch radius? The valley and 'flat' on the tooth I can work out, but finding the centre is defeating me!

Regards

Steve

26/10/2020 16:58:02
Posted by JasonB on 24/10/2020 18:26:56:

If you have CAD then you could draw them up from this

Thanks Jason, helpful as ever.

Much appreciated.

Steve

24/10/2020 18:11:16

Where can I get hold of meccano chain wheel drawings in .dxf format ?

I have an old radio that using rubber drive belts for part of the tuning mechanism and they perish very quickly, as they get cooked by the valves.

Meccano chain drives would look neat and be a long lasting solution.

TIA

Steve

Thread: Marking out blueing or pens?
17/09/2020 10:22:08

I started off using acidified copper sulphate solution, mainly because I was learning from books that came out of the Ark's library. Then got converted to a big fat black Sharpie and never needed anything else for marking out.

Thread: A new [to me ] style of scam eMail
15/09/2020 11:50:24

Just 'block sender' and delete, really not worth messing with. You can track the issuing mail server (sometimes) and eMail a complaint, but I think those 'abuse' mail addresses just point at a delete folder.

Regards

Steve

Thread: 6mm Metric Fine Screws in Brass
06/09/2020 13:06:13
Posted by Emgee on 03/09/2020 22:49:22:

Steve is that M6x.75 mm ?

If so I can cnc them, if you only need a couple I could do them for the cost of material and postage.

Emgee

Thanks for the kind offer, but I am after quantity. I can manage with 1mm pitch, it's just that 0.75 or .5 would make for a better job.

regards

Steve

06/09/2020 13:04:39
Posted by David Noble on 03/09/2020 21:05:41:

Hello Steve,

Accu are good.

David

Looks they have good stuff - but only 1mm pitch in Brass (£1.95 each, so should be good!).

I look to them in future.

Regards

Steve

03/09/2020 20:19:27

Struggling to find 6mm metric fine crews in brass. Looking for cheese head 25mm - 50mm long.

None of the usual suspects appears to stock these - anyone know of a specialist supplier somewhere?

Steve

Thread: Warco Minor mill/drill
02/08/2020 11:50:41

Andy, this is how I added a DRO to the Minor. The DRO is simple type from Arceurotrade. Then I just took a piece of aluminium plate and bored a hole in it to be a slide fit over the spindle assembly. There is a caphead screw out of sight which acts as a locking screw to stop the plate swivelling.

The plate is then useful for hanging clocks off...but you lose the depth stop which I miss very rarely.


I drilled and tapped a hole for a mounting plate in the mill casting to hang the DRO off.

I have a graph somewhere of the the DRO readout plotted against the manual readout off the fine feed, apart from a stiction/backlash problem the graph wanders about all over the place!

mill.jpg

01/08/2020 18:11:40

Warco Minor? I cut these bevel gears on mine and machined the cams for the Nemett four stroke. So the machine does work. You must put a DRO on the Z or it will drive you nuts!

p1030390.jpg

Thread: Today's delivery
30/07/2020 14:48:26
Posted by MC Black on 30/07/2020 08:33:15:

I ordered a yard length of #10 - 32 studding from the only United Kingdom supplier that I could find.

It came wrapped in a layer of bubblewrap in a 3" diameter tube.

It was bent.

If it was in bubble wrap inside a 75mm tube and a metre long, it can't have been that bent! If Parcelforce managed to bend it without damaging the tube, then they must have had a touch of the Yuri Geller going on!

Steve

Thread: Opions sought on using the USB Photo Stick for photo storage
30/07/2020 09:46:41

I don't like manual backups of anything, because they get forgotten and the media lost. I have a load of USB sticks. Somewhere.

Cloud storage is often free depending on storage requirements and fully automated and 'always on'.

If you are like me and can't quite make the move to moving the electronic copy of my life onto some remote hard drive, then you can buy a NAS drive and have the 'cloud' copy tucked away in the house. I use 'Allways Sync' so that hard drive always contains upto date copies of work from any of my devices. The weakness in that plan, is that I make manual copies of the remote drive onto a portable hard disk once a quarter and then lock that away, off network.

Manual sticks I only ever use for file transfer - typically from the Laptop that generates gcode to the PC in the workshop that runs mach3, though I am tempted to put the workshop PC onto the network and get rid of those sticks altogether, because the temptation then is to alter the drawings on the stick, which then don't match the 'Final' versions on the laptop.

The irony is that I first got involved connecting cnc machines to ethernet to eliminate paper tapes in 1983/4 so I'm a bit behind at home!

Thread: Further Adventures with the Sieg KX3 & KX1
30/07/2020 08:48:26

I notice that the Axminster versions of the KX1 and KX3 have Ethernet interfaces, I guess that is yet another version of controller board. Anyone know which one?

Regards

Steve

Thread: Calculating Feedrates for drilling with the Sieg KX1
18/07/2020 19:09:40

Thanks Jason, I calculated manually 3032 rpm and 156 mm/minute which is a bit more aggressive, but I can see that I've been a bit optimistic with the "feed inches per revolution" value. If I back it off to where it should be I get your numbers. I'll go and run with that, see how it works out!

Regards

Steve

18/07/2020 16:38:43

 

I've been puzzling over the feed rates when drilling with a CNC. I found this table, but it doesn't link to material type. How do I calculate feed rates when drilling?

A specific would be drilling 3mm holes in EN3 square bar as opposed to drilling 3mm holes in aluminium. How do I go about calculating the feedrate in those different materials.  If I use that data, then I get to 150mm/minute in mild steel - is that about right?

Table:
 

Recommended Feeds of Various Diameter Drills

Diameter of Drill - Inches Feed Inches per Revolution

Under 1/8 001 to .003

1/8 to 1/4 .002 to .006

1/4 to 1/2 .004 to .010

1/2 to 1 inch .007 to .015

Edited By Steve Withnell on 18/07/2020 17:07:42

Thread: Which Milling machine and what is its footprint?
05/07/2020 18:30:09
Posted by Bazyle on 02/07/2020 00:18:50:

My Warco minor mill drill fits on a 2x2 bench. They don't stock them anymore just the bigger Major but the equivalents from several importers appear on ebay every week. Perfectly adequate for small work though people like to moan about round column mills. Tilting head is just another thing to go out of true. Tilting vice is dead cheap.

I still have my Warco minor and won't part with it. If you fit a DRO to the Z-axis and think through the machining process when setting up it's perfectly sound. It's also a very good co-ordinate drilling machine. One benefit is that it runs slow enough to cut gears (I've used mine to cut small bevel gears) and run slitting saws.

Good workhorse!

I agree, tilting the work during setup is a better option.

Thread: Gear Generator
26/06/2020 09:20:57
Posted by SillyOldDuffer on 25/06/2020 10:46:09:
Posted by Steve Withnell on 25/06/2020 10:17:48:

They don't make it obvious do they! Try this page, Personal Use 1 year. Next year they'll ask you renew it, still free for personal use. (How long it will stay free for personal use will last is unknown, but at the moment there is no intention to charge for it. I think the game is to establish lots of trained users who will lean on employers to get them the commercial version. Might work - it's far more expensive to train people than buy software.)

Thanks Dave.

I've been using Eagle and that's full on too, but just about got that sorted. I'm struggling at the minute to move from 2D (Vectric Cut2D which is dead simple) to 3D packages.

Steve

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