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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.

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Thread: Workbench idea
21/11/2016 09:56:02
I wouldn't rush to weld the clamps....

They seem to do the job in the "real" world.
Filling the tube with sand...well it would certainly damp vibration somewhat.
Thread: Savage Aggressive big files
15/11/2016 21:18:31
Ditto
15/11/2016 08:59:35
Pm sent.
Tia
Thread: Scary stuff you can buy on the net
12/11/2016 16:22:34
There is a site/blog...that is called something like .." I won't work with that".

Chemist

Ok the writer has found an enthusiastic Chinese supplier..that appears capable and willing to supply any quantity anywhere.


So far so good

One of the chemical s listed (it is suspected that they have just shoved the whole catalogue on their website).. is flurineperoxid. .FOOF. .now the writers idea is to have a whip round to mass order a few kilo and see how big a crator they make while brewing up the order...
Thread: Stiffness for an indicator mount
11/11/2016 20:42:35
Wouldn't measuring anything remotely bendy.....


In my experience. .yep
There are many sources of error..a consideration of all of these needs to.be made.
09/11/2016 09:07:38
Just for info

The TESSA height gauge I used sensed the force ( strain gauges) of contact and recorded the "height" ( actually it also had a second axis but enough about that)..at a consistent contact force.
This in effect nulls out any bendyness in the system..probe..column etc.
The whole thing run on a air film for positioning then lands to measure...
Lovely instrument. .used to 0.1micro meter. .I always wondered just how much effect any "lean" of the part might have...

Edited By jason udall on 09/11/2016 09:11:43

08/11/2016 10:04:00
Arr..re read the op.

You already have the arm..you are just about the coupling.
08/11/2016 10:02:04
If being used as a "comparitor".

The droop will remain the same, and hence irrelevant, if the measurement "force" remains the same.
Careful design of the clock will mitigate the variation of force with measurement displacement. .
That aside stiffness or rather lack of stiffness will frustrate you evey time you use it.

I second the tube solution..maybe with rod under tension down core
Thread: Iron Ring
05/11/2016 09:11:50
I have only recently heard of this.

Canadian Engineering Graduates ( from at least some university)
Can ( by invitation) be asked to join a fraternity that wear an iron ring
To signify the ethical commitment to the craft.


Anyone out there with experience of this..
Thread: What Did You Do Today (2016)
04/11/2016 08:58:19
Neil. ..like many situations.
If gentle technique won't work..something is going to be sacrificed.
Decide do you want the chuck or the motor/gearbox.
This decided , allows more "options"
Thread: Geeetech Prusa I3 Pro B
28/10/2016 13:18:02
And bed leveling
..you can drive yourself potty changing feeds/speeds. ... temperature. ..slice parameters. ..etc.
But it all fails if bed not "level" and at "correct" height..
I know...
Thread: Nickel Plating Brass
07/10/2016 12:26:56
Thanks.
Thread: Pullies Vs Gears
07/10/2016 12:22:22
OK.

The op needs say 2.5 kg weight ( yeah I know kg is mass but lets skip that fir now) hanging on string. ..falling say 1 m
It does this in 1.5 days.
He needs 4 m of fall in 8.5 days.
Apart from needing a winding drum in the clock to hold 4 m of string..
A simple block system with four times the weight would work.

If comments along the lines of "are you sure your over a cubic foot of metal really only weighs 2.5kg" are un helpful... well sorry to have spoken.
Good luck and farewell
07/10/2016 10:26:07
Just in case anyone intrested..
2.5 kg .. rough terms 250 N
Falling through say 1 m
Is 250 J oules...
In say 36 hours...
250/36/60/60 = 1.9 mW
...
.
07/10/2016 10:15:39
Here's a thought...this chaps lead weights only 9.5kg ...where current esitmates are around 200 kg...
This would give a density of 9.5/200 *11 or 0.5 mmm...nice metal you have there...does it float on water by any chance?...
07/10/2016 10:06:37
Re weight/size.

Well I have density of lead as 11 gramme/cc
Or 11 kg/litre
A litre is 100 mm cube

300x250x450 would by my reconing be about 33 litre 371kg 3/4 of that say 200 kg...:O
07/10/2016 08:49:06
Btw...my estimate of ten kg of lead is less than a liter

100x100x100 mm
07/10/2016 08:46:51
Two things.
You can't use gears to regain the "lost" torque. ..
If possible then a series of gears could power the national grid by the fall of rain into a tea cup.

Sorry..

The possible things are...
Reduce torque to drive clock...probably done to death already
.reduce winding drum diameter. ..hence increasing capacity ( using thin string/cord)... thus the number of revs of drum remain but more force (torque= force x drum radius)..bigger weight
.
Or again extra gear train between winding drum and current bits of clock...
This too will lead to more force but shorter fall.

But you cant get over the basic thing...to run your clock needs so many watts..and that equates to a number of watt seconds for your week run time. ..
That has got to come from a weight falling through some distance. ..
Double weight half distance and visa versa
07/10/2016 07:50:19
Since a "multi purchase" block n tackle trades long pull at low force for short pull at high force...
You want a weight to fall say 4feet at 2.5 kg.
But really want 16 feet at 2.5 kg
thus a ten kg weight would in an ideal world suffice..
I would make the blocks allowing for say a 12 kg weight but adjustable down
A fourne purchase is modest...
Bear in mind the support doesn't need to be part of the clock...
Imagine hanging a weight on the wall from a block 'n' tackle ..with simple pully under clock redirecting fall end of cord....

The down side might mean a very large winfing drum in the clock.
Thread: Audi recall
24/09/2016 22:56:58
Funny you should mention the Olympic rings....
The four ring logo originates from the same country. . (Party) at around the same time.
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