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Search took 0.00 seconds. Search: Posts Made By: iaindunn
Forum: Construction Equipment Tech 05-03-2011, 04:17 PM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Just pm'd you the files

Iain
Forum: Construction Equipment Tech 05-02-2011, 05:19 PM
Replies: 49
Views: 23,196
Posted By iaindunn
Re: DIY Hyd Pump

You can buy ordinary mod 1 or.8 gears either brass or steel. Specially shaped gears make no difference at this scale.Suppliers in UK are Conrad or HPC gears. I cut my own gears because its fun...
Forum: Construction Equipment Tech 05-02-2011, 08:00 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Hi Ted could you pm me and I'll send over files. I use express pcb for layput and schematic and not sure how to post thos here.
I
Forum: Construction Equipment Tech 04-29-2011, 02:51 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

No worries Ted.I'll dig ou the hex files and my layout over the weekend and post here.

Iain
Forum: Construction Equipment Tech 04-28-2011, 03:05 PM
Replies: 5
Views: 4,039
Posted By iaindunn
Re: Leimbach pump tip

I believe they use standard o rings as shaft seals. They are not particularly good and I have the same problem on my diy pumps. I changed to proper shaft seals and have not had a problem since. They...
Forum: Construction Equipment Tech 04-28-2011, 09:23 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Would you prefer the assembler as you then play around with it in mplab ?
I have posted the assembler for the pump switch above:
Below is the speed control based on microchips simple esc desigen...
Forum: Construction Equipment Tech 04-26-2011, 11:35 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Here is a link to short video showing my excavator running with my control board. I have it programmed so when all sticks are neutral hydraulic pumo will switch off after 2 seconds. Hope you find it...
Forum: Construction Equipment Tech 04-26-2011, 09:12 AM
Replies: 49
Views: 23,196
Posted By iaindunn
Re: DIY Hyd Pump

DIY pumps are not that hard to build..just require care an lapping in to get the clearances to a minium. I have built around 4 pumps varying from 10 bar at 400ml /min9mod 1 9 teeth x.1" deep) to a...
Forum: Construction Equipment Tech 04-25-2011, 10:05 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

No the board has 3 escs' on board as well, 1 for slew and 2 for track motors and a 5v supply .

http://i376.photobucket.com/albums/oo206/iaindunn/hymaccontrolboard.jpg
Forum: Construction Equipment Tech 04-25-2011, 05:20 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Hi again. just thought I would include a pic of my control board amd circuit diagram. This has 3 speed controllers and the hydraulic pump switch on it. The pump switch is good to about 4 amps without...
Forum: Construction Equipment Tech 04-24-2011, 01:25 PM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

hi all
here is the asm code for a pump switch as used in my excavator for a couple of years. Works on a 12f675 pic. I'll try and post a link to video of it working soon.

...
Forum: Construction Equipment Tech 04-24-2011, 05:53 AM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

If you look at performance graphs for gear pumps the faster they rotate the greater volume they move which overcomes the internal leakage more and more.
However like most things there is a...
Forum: Construction Equipment Tech 04-22-2011, 02:22 PM
Replies: 48
Views: 21,583
Posted By iaindunn
Re: Hydraulic Pump Motor Control Options

Hi All just joined.
If any one fancies a roll your own pump switch based on a 12f675 pic and a fet then I can post the code and schematics. The dead band can be easily programmed and the delay time...
Showing results 1 to 13 of 13

 
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