By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for jason udall

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

Thread: How to do 100 divisions
10/02/2020 19:54:40

Who ever put the "add posting button " tight to the terms and conditions link ...not for the first time have I lost an erudite and illuminating post at the last herdal...

Back to point.... either

Take circumference by wrapping strip of paper

Divide this length with drafting techniques..transfer these divisions back to wheel.


Turn wheel to have circumference yielding convenient division  

Or use cad to divided wheel and print paper strip.

Glue down and over varnish.


The latter works for me ..also get better contrast for my tired eyes.


Edited By jason udall on 10/02/2020 19:57:12

Thread: Does solder seep into copper plate ?
16/01/2020 14:57:50

Further to my last.

In the electronics industry.

We from time to time need to verify the lead free status of components .

Lead detection "pens" exist for this purpose.

So for the purpose of detecting leaded solder than maybe these might be illuminating.

16/01/2020 13:47:37

It is generally considered that in lead/tin solder ( and I guess to some extent lead free) that an alloy layer forms tin-copper

If you etch with acid the tin may be left with copper being removed first ( my recollection of relative reactivity is hazy)

I know in brass(copper zinc) The zinc can go first leaving spongy copper behind...but don't know it is in tin copper being ( bronze seems more durable)

Thread: 2nd Hand Hearing Aid Reprogramming?
17/12/2019 18:51:48


A quick Google leads to a lively community of home programming of Widex aids.

17/12/2019 18:46:54

It's not impossible that the manufacturer of the aid, doesn't licence the "programming" software such a way that there is a licences fee per "installation".

Seen such with software to programme PLC's and VFD. For my money....those companies don't get my trade but you get the point.

Same thing used to happen with cad post processing..

Any way it might not be the chap at SS but some Sharpie at the hearing aid company that's behind this.

Thread: Soldering with tin
13/12/2019 18:17:54

Slightly confused here.

You wish to solder using pure tin

( Lead free electrical solder is tin 97 % plus

With silver and flux to suit


You wish to use low temp to protect the temper of the steel add ons


Now leaded based solder melts at a lower temp than lead free.

So if leaded solder( I have seen it used as tell tale for tempering) needs too much heat for your application ,the lead free or pure tin will be worse from the point of view of disturbing the temper.

There are special alloys that melt at less than even leaded solder...."magic metal" from memory..sold for PCB rework.. basically used to de-solder surface mount chips

This stuff is expensive but not silly

It's structural strength is unknown to me

Google "de-solder alloy"

Chip quick is one brand


Edited By jason udall on 13/12/2019 18:22:26

Thread: Mystery wiring on a small DC motor
21/11/2019 18:58:59


My suggestion would be a damping function.

By shorting a small DC permanent magnet motor

The tendency to self limit the movement speed.

Basically using "back emf breaking"

Unless as suggested the single wire has two conductors then no current could flow to power the motor.

Thread: Drill running off course
17/09/2019 10:19:01

I would add.

Drill chuck run out and straitness

Though 2 .5 is not silly small(try 0.3 mm) the tool holding is critical. 0.1 run out on a 10 mm drill is sort of acceptable it's far too big on a 2.5 mm drill

And typical drill press chucks aren't made to hold small drills well. Plus what rpm. I doubt you are spinning the drill any thing like the 10's of thousands of rpm "ideal".

Thread: Coping with form and function
03/08/2019 11:19:10

And if you haven't already take a look at is indicator build

Thread: Q: Print Nozzle Hole Shape?
31/07/2019 23:06:51

Printers print in *all* a circle cross section will present a constant profile at all directions in the day plane.

Any other profile would give no advantage in an arbitrary angle even if a slight advantage in X or y only feed

The theoretical 0.4 mm dia nozzle would give corners of 0.2 rad. In practice the smoosh of the plastic gives a shape that is at this scale more to do with fluid dynamics than nozzle geometry.

Thus for no gain we change from simple drill/team to broach...more complex for no gain

Thread: TTFN
18/07/2019 17:14:23

Andrew. You are a big boy now


You need no ones permission to withdraw your contribution to the forum.

I will miss it but share your lack of need for the drama.

I come here for the engineering

If some (one) doesn't understand the contribution that "production" techneques bring to the hobbyist then more fool them.


Edited By jason udall on 18/07/2019 17:15:08

Thread: What are these used for please?
09/07/2019 08:05:45

Item three.... knurling tool of some scale

Thread: Electricity Supply
10/06/2019 16:04:33

Thrid time trying..very trying

Rolec charge points 32A single or three phase

Let's say 7680watts( assume cos phi near 1)

Assume 80-90 percent conversion in charger and battery

6144 watts

Modern showers worse than that

Tesla model 3---60 kwhr

So that's overnight

All do able

Apart from when everyone is doing it and your kerbside parking is not near your house tonight...not all have drives

And just imagine all those charging leads across the pavement?

Thread: Which thread for T nuts
09/05/2019 18:12:25

I have some tee nuts...long version longer to spread load..


If you made long nuts tapped say 10 in the middle and say 6 mm and 8 mm either side..thus , as has been said you have the flexibility to use the thinner studs...


Edited By jason udall on 09/05/2019 18:13:28

Thread: You tube videos of entertainment if not informative
29/03/2019 19:03:29

Here's another quirky YouTube video

This guy is fun


Bonkers but definitely fun

Thread: Metal ball joints for 1/3 scale action figure?
15/03/2019 15:50:04

Just had a thought.

Might be a bit ott but what about a knogo(so?)

Dial guage/ indicator stand? I have used in the past could be see for friction and "posed"

Thread: Lathe screwcutting
06/03/2019 19:46:02

Err just checking....when you inverse tool.....did you check tool height.... don't ask

Thread: Precision division plates
06/03/2019 19:31:05


So the base accuracy of dividing head is matching of worm and wheel...

This first needs two threaded parts. .of the same pitch and diameter.

One is made into a tap...

The other becomes your worm.

The tap is used to cut the worm... choosing the pitch/circumference ratio desired...which regardless of the pitch will be known...we now have accurate reduction drive.

Now let's think about how you without a screw cutting lathe could generate a screw thread if CONSISTANT pitch?...

Chase a long screw fine as you can file the chaser

Now arrange to hold many pitches of this thread ( two flat plates) now have a CONSISTANT but weak thread...use this to drive screw cutting for stronger thread also make the screw thread required above....

For a laugh...Google Watt micrometer for

Thread: You tube videos of entertainment if not informative
24/01/2019 17:58:25

Just be clear
The chap is Pablo Cimadevila Alvarez

I don't know where the link to Sebastian Rodreguez Veloso posted by jon laws came from but maybe the comments about dodgy past need review/moderation

Mods Edit. Posts about the wrong man have been removed.


Edited By JasonB on 24/01/2019 18:35:44

24/01/2019 17:51:57
Here's a link for Pablo

In this I see a more plausible birth date of 1976... The previous wiki suggested 1957...
Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Eccentric July 5 2018
Allendale Electronics
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest