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Member postings for Andy Stopford

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

Thread: 9x19 / 9x20 lathe gearing
28/04/2020 19:57:48

Assuming it doesn't have a screwcutting gearbox, you'll need some extra changewheels - the gear train at the left hand end of the machine is likely set up to give a fine feed rather than for screwcutting.

Which changewheels you need depend on what threads you wish to cut, but the following link lists a typical selection:

https://www.arceurotrade.co.uk/Catalogue/Machine-Spares/SC3-Mini-Lathe-Spares/Super-C3-Change-Gears

To learn more, see these articles:

http://www.lathes.co.uk/latheparts/page6.html

http://www.lathes.co.uk/latheparts/page14.html

Thread: Tee shirt
25/04/2020 20:41:55

Here's a load of Artzybasheff stuff:

https://www.flickr.com/photos/x-ray_delta_one/sets/72157622345988524/

25/04/2020 20:30:42

Its this guy, I think:

https://en.wikipedia.org/wiki/Boris_Artzybasheff

(The Diego Rivera stuff's great too)

Thread: Shoe repair glue advice?
17/04/2020 20:02:11

I've used hot glue (the cheap Parkside sticks from Lidl) very successfully, but you have to work fast. I found judicious pre-heating with a hot air gun gives you a bit of extra time, and being generous with the amount of glue increases the thermal mass and slows setting. Also give the glue-gun plenty of time to get really hot - that stuff sticks practically anything if its hot enough.

It's good to prepare some sort of clamping arrangement first, especially for the area at the front, which seems to be the point at which unsuccessful gluing attempts fail.

Like IanT, I used to stick rubber repair soles onto new leather-soled shoes - it made them less lethally slippery too.

Thread: Arduino/Mendel 90
11/04/2020 20:11:08

Windows doesn't like you to muck around with the contents of the Program Files folder (I'm presuming that's where Arduino is) - you need to have "Elevated Permissions" to do this.

Its a long time since I've used Windows, and I think what you have to do depends on which version you have, but here are a some links to possible solutions:

https://social.technet.microsoft.com/Forums/ie/en-US/3dd0d2f9-5b2f-46df-950f-36887c98369c/give-full-permission-for-the-users-in-program-files-folder?forum=w7itprogeneral

https://www.howtogeek.com/howto/windows-vista/enable-the-hidden-administrator-account-on-windows-vista/

https://helpdeskgeek.com/windows-10/log-on-as-administrator-in-windows-10/

The latter two links allow you to login as "Administrator", after which you may be able to edit the boards.txt file OK

10/04/2020 21:10:48

I seem to remember having a difficulties with this after replacing a burnt-out mainboard on my Wanhao i3.

If you go to Tools>Board: and hover the mouse pointer over this entry, a fly-out menu should appear. Scroll down it to see if Sanguino W/ATmega1284 is listed. if not proceed as follows:

Close the IDE

You have to make sure that the your boards.txt file has an entry for the sanguino board. This file is inside the arduino IDE folder. Here is the path to mine:

/home/andy/Programs/Arduino/arduino-1.8.9/hardware/arduino/avr/

I would guess that on a Windows machine the path would be Program Files/Arduino etc.

Open boards.txt in a text editor and copy/paste the following to the bottom of the file and save.

##############################################################

atmega1284p.name=Sanguino W/ ATmega1284 or ATmega1284P (16MHz)

atmega1284p.upload.maximum_size=130048
atmega1284p.upload.maximum_data_size=16384

atmega1284p.upload.protocol=arduino
atmega1284p.upload.speed=115200
atmega1284p.bootloader.path=optiboot
atmega1284p.bootloader.file=optiboot_atmega1284p.hex

atmega1284p.bootloader.low_fuses=0xFF
atmega1284p.bootloader.high_fuses=0xDE
atmega1284p.bootloader.extended_fuses=0xFD
atmega1284p.bootloader.unlock_bits=0x3F
atmega1284p.bootloader.lock_bits=0x0F

atmega1284p.build.mcu=atmega1284p
atmega1284p.build.f_cpu=16000000L
atmega1284p.build.board=AVR_SANGUINO
atmega1284p.build.core=arduino:arduino
atmega1284p.build.variant=sanguino

############################################################

atmega1284p_8m.name=Sanguino W/ ATmega1284 or ATmega1284P (8MHz)

atmega1284p_8m.upload.maximum_size=130048
atmega1284p_8m.upload.maximum_data_size=16384

atmega1284p_8m.upload.protocol=arduino
atmega1284p_8m.upload.speed=57600
atmega1284p_8m.bootloader.path=optiboot
atmega1284p_8m.bootloader.file=optiboot_atmega1284p_8m.hex

atmega1284p_8m.bootloader.low_fuses=0xFF
atmega1284p_8m.bootloader.high_fuses=0xDE
atmega1284p_8m.bootloader.extended_fuses=0xFD
atmega1284p_8m.bootloader.unlock_bits=0x3F
atmega1284p_8m.bootloader.lock_bits=0x0F

atmega1284p_8m.build.mcu=atmega1284p
atmega1284p_8m.build.f_cpu=8000000L
atmega1284p_8m.build.board=AVR_SANGUINO
atmega1284p_8m.build.core=arduino:arduino
atmega1284p_8m.build.variant=sanguino

############################################################

Re-open the IDE and see if you now have a menu entry for Sanguino. If so, make sure you have that selected before trying to upload the sketch (I think it's the 16MHz entry, but not certain).

Thread: New design of mains plug?
31/03/2020 19:55:43
Posted by Maurice Taylor on 31/03/2020 16:16:52:

Can anybody remember why we changed from red and black wires to brown and blue for live and neutral ? I think this was approx 50 years ago for flex but only 15 years ago for twin and earth.

Because having red for the live wire and green for the earth had potentially unfortunate consequences for people with red-green colour blindness.

30/03/2020 20:12:39

As I understand it, the main, even sole, reason for having a fuse in the plug is to protect the flex in the event of a short circuit in the appliance.

With the high currents possible with a ring main, the circuit has to have a high rated fuse, which might not blow even though a faulty appliance is drawing enough current to set its flex on fire.

Although this kind of fault seems a bit implausible with the sort of things we plug into the mains these days, I suspect it might have been more of an issue when the BS for these was devised, e.g. a radiant bar heater might have a 'partial' short circuit across its coils (amongst its many other house-fire-starting modalities).

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