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: Bows and arrows|
For answers to this and many other questions I recommend
The Evolution Man .by Roy Lewis
Not a thick book
Deals with life of a bunch( troop) of proto man.
From fire ,cooking, fire hardened spear, bow and arrow , burial .
Though fiction it is well researched
Edited By jason udall on 26/08/2020 20:06:39
|Thread: Making sense of big numbers|
Turn the handle on this
Nano parsec per micro fortnight.
Answer is illuminating in inches per
|Thread: component tester|
Just a thought.. does it still misbehave out of metal box?
Just to say the LCD is "powered" via what was described by sticky tape.
Also contacts are present on topside of the pcb so might
be shorted by case .
It might be stuffed but it might not .
Btw I think it might be working but in " foreign"
|Thread: Set up tool???|
Lump of rubber. Long wire(knitting needle).. continuously adjustable ratio.....
|Thread: Increasing Print Area|
Gentle readers...remember the longest axis for your part can be the diagonal of the built SPACE not just the platform.
Also having layers non parallel with the face of the part can optimise your build strength.
Though if you are building in a heated build cab say 70degrees your interlayer bonding improves s lot
Link to video about the perils of french bayonet.
Edited By jason udall on 05/05/2020 18:45:59
|Thread: Digital Vernier gauge|
IPA..iso propol alcohol..propan 1.1 ol'.
I prefer this to meths.. 90+ percent as supplied versu 60 percent ethanol in meths...meths barely burns theses days . Barely (and possibly not even) strong enough as hand sanitizer....in any case IPA will even release hot glue....
Skipping over the err.... language..perfectly correct but at moment in helpful.
Glass panel...do you mean the glasing of the case or the LCD itself.
If ,the window in the external case , then at first go try softening the glue with IPA.. or meths .
Hot air might work too.
|Thread: How to do 100 divisions|
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 ?|
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.
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?|
A quick Google leads to a lively community of home programming of Widex aids.
It's not impossible that the manufacturer of the aid, doesn't licence the "programming" software ...in 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|
Slightly confused here.
You wish to solder using pure tin
( Lead free electrical solder is tin 97 % plus
With silver and copper...plus 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|
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|
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|
And if you haven't already take a look at is indicator build
|Thread: Q: Print Nozzle Hole Shape?|
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
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?|
Item three.... knurling tool of some scale
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