Member postings for jason udall

I feel kind of spoilt at work.HARDCREAT...Seen five Hardinge lathes installed...not one needed "leveling"..installation even notes this..DO NOT ATTEMPT TO TRUE MACHINE BY JACKING.

now Mazak...thats a different horse..much as discribed here. still if you want it true to 0.15 micron on 200 mm....and that was at limit of "clock". .. we work to +/-3 microns in production but then most things ground later....

But none of this answers OP

Looking forward to the answer when he has checked HS out

Rgds

Btw PRESSURE vs FORCE

ballerina on point weight say 40 kg (400 newtons)[ 80lb say] 1" csa = 80 psi

tank 56 000 kg tracks 6m by 1 m say {123 000 lb234 " by 39"] = 13.4 psi

Now which ould you prefer to stand on your foot ?

Thanks...Fits might help in some cases....I all ways seem to try for too "nice" a fit...learning that this is not always desirable...friction vs sealing...oh well another engineering comomise compromise....

Edited By jason udall on 11/06/2012 11:36:58

Not arguing with the "accuracy vs resolution" warning but the article in MEW shows a , {to me}, sympathetic ADDITION of a digital scale to an existing instrument.

Agreed , strapping a digital scale to a base and using a out of square arm and column will not achieve the expected (or advertised ) level of accuracy , but again that’s not what was done.

Using a height gage (sic) as a marking out tool is more of a "sin" {to me} but then I am new to home engineering.

but hey , I come to this from electronics....component tolerances 0.1 to 20 % ,device parameters (for same device ) of 10 to 1,000 ...it all had to work within spec. first to 1000 th off the line.

btw

Always wonder why no tolerances shown on MEW drawings ,It seems in Mechanical engineering that production drawings are often tolerance in "strange" ways ..I have seen features tolerenced such that other features entirely disapear..if dimensions exert to limits. Seems to be getting worst too...are they relying on 3sigma?

Rdgs

Love this.

Nice to see some original research.

thanks for sharing

better still SM wire is also available on a roll

Found this and wnted to share. Might be of intrest in concept at least

link is to a simple SMART alloy "powered" machine... HMMMM

http://www.grand-illusions.com/acatalog/Heatmobile.html#a354

If that switch were contactor.

1 --- 2

3 --- 4

5--- 6

where are the armature connections ?

think of thing as large relay.

normally wired so one contact set powers "coil" with green push button( NO) wired in parralel abd red opush button in series (NC)

{reaches for pen to make sketch....}

The reassemblies fine.

Its the urge to "improve" I need to resist.

Oh and plastic "NIBS"

... and ultrasonic welding of cases...

"no user servicable parts inside ? " Yes there are! but the case is a S*D to open

Not specialy useful but sort of on topic.

If i remember correctly ..the first lighthouse on Langstone Rock was "cemented"

with molten lead.

And the tail tells of spmone(I think the inventor of the technique) looking up just as moltern lead dropped from above and an amount going down his throught.....now that would be odd shape casting

And on that point I'm off to put the equivalent of 630 Kg of TNT the car.

Edited By jason udall on 08/03/2012 13:21:26

nice result

nice result

Sorry Bazyle and others ment as joke.

Use collent stops day in day out

5C abd 16C

and indeed adjust screw from frount is one way.

Doesn't fix the variable pull back due to variation of part diameter though does it

A few things to observe

1 OP stated they knew that swaping the phases changed drection but not WHY

there followed a good description /explaination...better than I could offer without , phasors ,vectors and lead /lag discuions

2 someone expessed their opion that in effect if you dont know what you are doing then leave it to a proffesional

there followed " I have seen xyz dodgy wiring from abc proffessional / diyer etc" and it all got abit tense

I too have seen shocking[ no pun intended] premise wiring.

Enough so that I don't even assume earth is earthy.

3 since this topic is way off topic.PAT [testing]

chinese IEC leads live and neutral swaped, earth WIRE missing

[part code for Euro three core] dummy green wire no copper

other leads..iron/steel substituted for copper core

fuses made to look right but in effect printed steel...the preverbel 6" nail

Lap top PC power supplies that make casing of laptop run at 300 to 400 V above earth

[these actualy meet spec...US market psu's]

Do I have apoint? Only one

Be careful..that brand new house could still be lethal as might the new 42" plasma.

peace

I rember when showing all fasteners at [say] 12 oclock was conidered lazy in DO

Just saying

mitatoyu or whatever...

normal micrometer screw with shaft encoder built round [splines]

encoder does pulse generation asic does count and display

Nice.

Now how about one adjustable from frount?

annealing s heat treating metal[mostly] so that when cooled the metal remains ductile

work hardnen able material like aluminimim alloys , copper, bronze [infact most stuff except steel] and some steels [ yeh I know] work harden and as part of that crystals form and grow

these crytals initally slide past each other when bending and forming the metal

once grown large enough they no longer slide but jam and the metal is "work hardened" futher bending /forming just breaks the material.

annealing resets the crystals to the initial small size ready to repeat the working

hardening ...as with steels is again effecting the crystal boundries [small for ductile large for hard] but to have to opposite effect ..you heat steel above what is known as the transition temperture and rapidly cool to control the crystals[in steel usally called grains].

tempering is fine tuning the balance of properties.

in short anneaing application of heat and cooling to softern or remove work hardening from a materal