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

Michael.

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* directions...so 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

https://youtu.be/7DZc94SBF0g

This guy is fun

Skilled

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?...one 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

Interesting

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 thread...as fine as you can file the chaser

Now arrange to hold many pitches of this thread ( two flat plates) ..you now have a CONSISTANT but weak thread...use this to drive screw cutting for stronger thread also accurate....now 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 https://en.wikipedia.org/wiki/Pablo_Cimadevila_%C3%81lvarez

In this I see a more plausible birth date of 1976... The previous wiki suggested 1957...
21/01/2019 15:42:51

Speedy Builder...

I too was surprised .

He works in gold and platinum but seems to show none of the "hygiene" over swarf seen in the gold trade.

Just watch his investment casting station.. foundry is too small a word.

This guy might find the fiddling about with swarf Vs time not worth it....lucky guy

21/01/2019 11:38:20
Can highly recommend other videos by him . He does the lost wax investment casting bit..
One of his things is to laser engrave finger prints of the customer into the inside of the ring.
20/01/2019 22:34:09

https://youtu.be/MgnlbDVuPdg
Accomplished jeweler makes ring out off two brass nuts...
Watch to end for "Why"
As assure this jeweler has some kit (other videos) to kill for. .laser welding/engraving

Edited By JasonB on 21/01/2019 12:15:51

Thread: PLA not Sticking to Bed
02/01/2019 16:33:37
I use"pritt" stick other brands available and also work

Thread: Horn Antenna for Radio Astronomy
03/12/2018 19:03:48
Looks about the same size as a J band one I built at uni.
Of course at J band even though simular size much bigger in wave lengths (J band is 15 to 30 mm ) and from memory Large end was 800 mm..again from memory output was 15 mm widest so area ratio 2800 gain of around 28dB measured mid band..
Learn to weld brass for this..using beautiful Oxy hydrogen torch..

Edited By jason udall on 03/12/2018 19:06:45

Thread: The demise of the High Street
03/12/2018 18:33:35
So. It would seem that the policy to discourage the use of cars from towns is a success.
Shame these same planners didn't see the obvious consequences...no cars =no drivers
No drivers= no customer for shops.

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