I don't see why it has be this way. Running a pump at full power past a
valve sounds daft. That's why the new pressbrakes, presses and injection
moulding machines use servo hydraulics.
Simply put, you have a gear pump, and both ends go to a cylinder. Turn one
way, rod extends. Turn other way, rod
On Sun, 8 Nov 2015 15:47:37 + (UTC)
richsh...@comcast.net wrote:
> I suggest looking at a hydraulic approach. It eliminates all of the drive
> lash problems with the rigidity problems that follow. Ingersoll Rand built a
> prototype mill similiar to what you are describing, you may find getti
On 8 November 2015 at 17:10, Karlsson & Wang
wrote:
> Hydraulic, that seems interesting how does hydraulic compare to a ball screw
> then it come to back slash and accuracy?
Accuracy is limited by the feedback device, I think.
Servohydraulic cylinders are a bit different to normal ones. They
g
> On 8 November 2015 at 17:10, Karlsson & Wang
> wrote:
>
> > Hydraulic, that seems interesting how does hydraulic compare to a ball
> > screw then it come to back slash and accuracy?
>
> Accuracy is limited by the feedback device, I think.
>
> Servohydraulic cylinders are a bit different to n
On 8 November 2015 at 18:26, Karlsson & Wang
wrote:
> Servohydraulic cylinders have low friction instead of perfect sealing?
The ones I have worked with, yes.
I was at the high-force high-accuracy end, though. 250kN 100mm stroke,
0.001mm resolution. (Schenck tensile tester)
--
atp
If you can'
> On 8 November 2015 at 18:26, Karlsson & Wang
> wrote:
>
> > Servohydraulic cylinders have low friction instead of perfect sealing?
>
> The ones I have worked with, yes.
>
> I was at the high-force high-accuracy end, though. 250kN 100mm stroke,
> 0.001mm resolution. (Schenck tensile tester)
I
On 8 November 2015 at 21:07, Karlsson & Wang
wrote:
> I suspect if a valve is used an motor running dynamic response could be good,
> do you know if it had good dynamic performance.
Yes, it was running closed-loop (on force) fatigue tests at 20Hz.
--
atp
If you can't fix it, you don't own it.
On 8 November 2015 at 21:12, andy pugh wrote:
>> I suspect if a valve is used an motor running dynamic response could be
>> good, do you know if it had good dynamic performance.
>
> Yes, it was running closed-loop (on force) fatigue tests at 20Hz.
An example: https://www.youtube.com/watch?v=6Dm
Any know if this Bodine motor would be suitable for a milling head ?
Bodine 42A5BEPM-E2
thank you,
other rick
On Sun, Nov 8, 2015 at 4:16 PM, andy pugh wrote:
> On 8 November 2015 at 21:12, andy pugh wrote:
>
> >> I suspect if a valve is used an motor running dynamic response could be
> good,
I have some hydraulic bits and pieces laying around that may be usable
for this. Just need to find some rams and or rig up some kind of
position sensing system as the rams i have found with integrated
position sensor are pretty spendy. Not sure how well the 24volt 5 way
valves i have will put
On 9 November 2015 at 01:38, linden wrote:
> Not sure how well the 24volt 5 way
> valves i have will put up with constant motion and at what speed.
You need proportional valves ("Moog Valves")
A hydraulic system could be excellent, but I see no way at all to do
it cheaply.
--
atp
If you can't
moog or pegasus. brands, those are the big names.
they were used to move really heavy cast iron slides, often dovetail.
messy ( plan on leaks and kitty litter )
the hydraulic supply tops up the volume from a reservoir that you keep full
these are really really beefy systems.
the internal of the v
there were hydraulic milling machines sold based on Moog hydraulics
and Bridgeport iron. I assume those two companies could screw things
up, but the world has moved on. To move a long distance takes a lot
of power. Small movements with a lot of force behind them are really
easy, that's why you s
2015-11-09 8:49 GMT+02:00 Eric Keller :
> there were hydraulic milling machines sold based on Moog hydraulics
> and Bridgeport iron. I assume those two companies could screw things
> up, but the world has moved on. To move a long distance takes a lot
> of power. Small movements with a lot of fo
> 2015-11-09 8:49 GMT+02:00 Eric Keller :
>
> > there were hydraulic milling machines sold based on Moog hydraulics
> > and Bridgeport iron. I assume those two companies could screw things
> > up, but the world has moved on. To move a long distance takes a lot
> > of power. Small movements with
On 9 November 2015 at 03:54, TJoseph Powderly wrote:
> messy ( plan on leaks and kitty litter )
> the hydraulic supply tops up the volume from a reservoir that you keep full
> these are really really beefy systems.
Indeed, the power pack for my testing machine was contained in a
soundproof wooden
On 11/9/2015 5:37 AM, andy pugh wrote:
> On 9 November 2015 at 03:54, TJoseph Powderly wrote:
>> messy ( plan on leaks and kitty litter )
>> the hydraulic supply tops up the volume from a reservoir that you keep full
>> these are really really beefy systems.
> Indeed, the power pack for my testing
On 9 November 2015 at 15:32, Dave Cole wrote:
> I've done quite a bit of hydraulic servo work for custom machines.
> You can use regular industrial cylinders for positioning.
I imagine that the reason that fatigue testing machines use
hydrostatic cylinders is that they want to be fatigue testing
Just for interest's sake, here is a 6DOF vehicle simulator in action.
It might recalibrate your ideas of how fast hydraulics can move:
https://www.youtube.com/watch?v=83PsmzwkVSs
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
---
Yes, I would be surprised of those cylinders were not special.
I remember seeing those machines at GM when I used to work there years ago.
They could really beat a car's suspension up and they would run them for
days and days to see if stuff would break, tear out, wear out, etc.
They were real
On 9 November 2015 at 17:37, Dave Cole wrote:
> They were really quite violent.I bet that hydraulic power system has
> a bunch of accumulators for super fast flow response.
That and (in our case) 2000hp of electric motors driving 20 pumps.
--
atp
If you can't fix it, you don't own it.
http:
On 11/08/2015 09:54 PM, TJoseph Powderly wrote:
> moog or pegasus. brands, those are the big names.
> they were used to move really heavy cast iron slides, often dovetail.
>
> messy ( plan on leaks and kitty litter )
> the hydraulic supply tops up the volume from a reservoir that you keep full
> th
On 11/09/2015 02:34 AM, Andrew wrote:
> 2015-11-09 8:49 GMT+02:00 Eric Keller :
>
>> there were hydraulic milling machines sold based on Moog hydraulics
>> and Bridgeport iron. I assume those two companies could screw things
>> up, but the world has moved on. To move a long distance takes a lot
>
2015-11-09 20:16 GMT+02:00 Jon Elson :
> On 11/09/2015 02:34 AM, Andrew wrote:
> >> there were hydraulic milling machines sold based on Moog hydraulics
> >> and Bridgeport iron. I assume those two companies could screw things
> >> up, but the world has moved on. To move a long distance takes a l
On 11/9/2015 4:55 PM, Andrew wrote:
> 2015-11-09 20:16 GMT+02:00 Jon Elson :
>
>> On 11/09/2015 02:34 AM, Andrew wrote:
there were hydraulic milling machines sold based on Moog hydraulics
and Bridgeport iron. I assume those two companies could screw things
up, but the world has move
On 11/9/2015 1:26 PM, Roland Jollivet wrote:
> I don't see why it has be this way. Running a pump at full power past a
> valve sounds daft. That's why the new pressbrakes, presses and injection
> moulding machines use servo hydraulics.
>
> Simply put, you have a gear pump, and both ends go to a cyl
26 matches
Mail list logo
