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Member postings for Brian Oldford

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

Thread: stepper driver
15/04/2019 20:16:25

More recent info on these boards here. **LINK**

15/04/2019 18:17:49

Duncan

Is the 5v derived directly or from the higher voltage supply?

Thread: Removing a grub screw
15/04/2019 16:07:33

"Easyouts". . . . . .Invention of Satan.

Thread: stepper driver
15/04/2019 15:42:48

There's a well documented issue with these inexpensive stepper driver boards., The fact is the designers of those boards did not follow the recommendations set by Toshiba for the power-up and power-down sequence.
There are other minor design faults but this is the one that can lead to total TB6560 failure.

In simple terms the logic (5v) supply onto the IC should be established and stable before the stepper drive voltage is applied to it and should be maintained until the stepper drive voltage is removed . These boards derive the logic voltage from the higher voltage via a 7805 (or similar) making this impossible as supplied.

There are mods that can be done to overcome this problem but they involve cutting of PCB tracks and the construction of a delay module.

The solution to the issue may be to hand by using spare pins of the Arduino, a MOSFET and a few more lines of code.

In depth discussion here. https://www.cnczone.com/forums/stepper-motors-drives/139306-can-tb6560-driver-design-violate-chips-specs.html

Good luck

 

 

Edited By Brian Oldford on 15/04/2019 16:08:56

Thread: broken calipers
14/04/2019 11:30:06

You could use something removed from these perhaps? **LINK** devil

 

Edited By Brian Oldford on 14/04/2019 11:30:50

Thread: anealing piano wire
10/04/2019 19:28:35

Grind a groove and use a miniature circlip or similar.

Thread: Would you mesh with this?
10/04/2019 08:05:12

As a complete aside, please can someone tell me why most horologists seem to use the cycloidal tooth form yet mechanical engineers mainly use the involute form? There's bound to be a simple reason.

Thread: Todays DUMBO award
04/04/2019 19:18:23
Posted by Mike Poole on 04/04/2019 18:17:58:

Just turn the tool upside down smiley

Mike

That's the "putting on" direction. cheeky

Thread: broken calipers
03/04/2019 17:35:01

There might some pearls of wisdom on the degree of temper here.

**LINK**

Thread: Non-Drip Gloss Paint
29/03/2019 12:15:12

I'd bin it anyway. I can never get a good finish from non-drip paints.

Thread: Temperature probe
24/03/2019 08:24:15

This youtube video by Ralph Bacon may be helpful.

https://www.youtube.com/watch?v=dRGX_8P_98w

Welcome to the Arduino world.

Thread: Making split bronze bearings [ silver soldering ]
22/03/2019 16:55:09

With any soldering operation cleanliness is next to godliness. Make sure you use sufficient flux to prevent oxidisation of the solder.

Thread: Taplin-Baker Hydrojet
13/03/2019 19:19:46
Posted by John Paton 1 on 13/03/2019 18:36:31:

. . . . . . .

All I need now is the lovely Taplin Twin engine to marry to the jet drive . . . . . .

Eye-wateringly expensive nowadays.

Thread: Castings
09/03/2019 19:51:14
Posted by Andrew Tinsley on 09/03/2019 19:42:56:

I didn't know there were standard colours for patterns. Where do I find the details please?

Andrew.

When patterns were predominately wood most pattern-shops used: -

Red - As cast

Yellow - To be machined

Black - Core-prints

Green - Chilled

Although some hobbyists would find automotive rattle-can finishes satisfactory a pattern that is needing to be used many times over is best coated in the proper pattern-coat.

Nowadays, with the advent of air-set moulding sand orientation of the pattern in the sand isn't so critical so denoting machined surfaces isn't carried out so often.

Thread: The Frrankenlathe
09/03/2019 08:09:03

I wouldn't want to carry that upstairs.

Thread: combining dis-similar DC power supplies
07/03/2019 22:32:35

Treated with respect ex-PC PSUs can make excellent bench PSUs albeit there may be a little ripple on the O/P. They often need a small base load to operate correctly which can be applied by putting a modest load resistor between +12v and Ground (0v). Some may need to be forced to turn the O/P on by earthing the green wire.

It is even possible to create a decent current O/P 24v or 36v supply by connecting two or three PSUs in series but very special steps must be taken. 

Edited By Brian Oldford on 07/03/2019 22:35:17

Thread: Milling Collet Jammed in Taper
05/03/2019 14:25:08
Posted by Martin Dilly 2 on 05/03/2019 14:18:47:

Many thanks, gents, for the replies, and so soon! I'll go and have another try later. Meanwhile a bit of belated Googling suggests that a Y-shaped wedge applied between the business end of the collet chuck and the quill might help to force things apart without applying hammers, lump, lead or otherwise.

If you are going to use a "wedge" technique it would be better to use two to form a pair of folding wedges thus eliminating any tendency to bend anything sideways IYKWIM.

Thread: AutoCAD substitute
04/03/2019 17:24:46
Posted by duncan webster on 04/03/2019 17:06:06:

Draftsight is free and is very very similar to AutoCad

Very painless migration path from AutoCAD too. It will accept many AutoCad commands directly Pattern/Array f'instance.

Thread: Can opener - the holy grail in engineering?
03/03/2019 18:56:01
Posted by fizzy on 03/03/2019 18:54:13:

. . . . . . . . . .And now the big question - are modern can openers designed to cut the lid from the inside or the top off the can from the outside? Wife says outside, I say inside (of can lip).

We've had both type in recent times and concur, they're mostly junk.

Thread: Myford ml7 countershaft pulley
28/02/2019 20:30:23

I think they are but can't swear to it but you could save yourself some time by visiting https://www.ebay.co.uk/itm/GENUINE-MYFORD-SUPER-7-MK2-COUNTERSHAFT-PULLEY-Lathe/232778039005?hash=item3632a6fedd:g:41gAAOSw945bBCJC:rk:42f:0

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