Recent Posts

Pages: [1] 2 3 ... 10
1
Electronics & IC Programing / Re: capacitive fuel gauge for petrol
« Last post by PK on Today at 02:31:44 AM »
I'm not 100% sure with the library he's using, but it will probably work like this:
I concur.
The good systems have some kind of calibration routine too.

The challenge may be that the value of C is so small that the library struggles for resolution and is swamped by noise.

With a 16pF cap you can make a fairly stable oscillator in the 250KHz to 1MHz range, the counter input on a micro should easily run at those speeds. Gate it with an interrupt (if the uC doesn't have a gated counter) and you'll get good resolution...
All armchair speculation of course....
2
Neat Stuff / Re: Definite madmodder!
« Last post by Pete. on Today at 02:16:14 AM »
I recognise those teeth!

Those are Schaeff rock grinder teeth. Very tough little beggars.
3
Neat Stuff / Re: Definite madmodder!
« Last post by SwarfnStuff on Today at 12:58:46 AM »
At least you are far enough away from the business end to avoid any stuff it tosses out. That plus the direction of rotation, which you state as wrong, seems just right for the same reason and it will never run away from you. (Might run you over tho if you fall asleep at the controls??)
 :lol:
Inventive contraption and fun to view.
John B
4
Neat Stuff / Re: Definite madmodder!
« Last post by Brass_Machine on January 22, 2018, 11:05:43 PM »
Definitely mad!

And the chain is connected to the "leg bone"    :lol: :lol: :lol: :lol: :lol:
5
Neat Stuff / Definite madmodder!
« Last post by vtsteam on January 22, 2018, 09:40:03 PM »
I love this kind of slightly silly yet successful approach!  :smart:

6
Electronics & IC Programing / Re: capacitive fuel gauge for petrol
« Last post by Noitoen on January 22, 2018, 06:28:36 PM »
Long ago, I did some experiments on a RV a plastic  water tank. I used a couple of aluminium tape strips on the outside and the tank and to simplify the capacitance measurements, I used a NE555 chip as a variable oscilator dependant on the level and to read the frequency, a PIC microcontroller. It worked ok.
7
Electronics & IC Programing / Re: capacitive fuel gauge for petrol
« Last post by awemawson on January 22, 2018, 04:23:18 PM »
To improve the stability to eliminate the sloshing effect it's only necessary to average the last N readings, adjusting N to meet the practical circumstances.
8
How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by philf on January 22, 2018, 04:11:35 PM »
Just out of interest, how are the scrolls in a 3-jaw (or any self-centring chuck) made? Rough cast then machined on a mill? Milled from billet? Forged?

I'm wondering.... how hard can it be  :lol: to just make a new scroll? :scratch: This is not a serious project BTW, I'm just curious.

Ade,

I would have thought a "useable" scroll could easily be made on a cnc mill.

Make out of heat treatable steel. Rough it out, harden and temper and then finish with a decent carbide end mill.

Phil.

(Do you still want the vice?)

9
Project Logs / Re: Little Blazer X4
« Last post by kayzed1 on January 22, 2018, 03:16:11 PM »
I'm watching also Doc...keep up the good work.
Lyn.
10
How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by timby on January 22, 2018, 03:12:54 PM »
We had a scroll made for a special application a few years ago,  it was turned on  a lathe.
Pages: [1] 2 3 ... 10