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Model Engineering in UK - Model engineering, metal crafts in UK
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Posted by Emimec on November 30, 2008, 8:46 am
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> Noticed yesterday that the old J&S 540 surface grinder, which doesn't get
> used much, was acting strange. When the cross table traverse feed is in
> use, it slows down the x axis power feed?
> I checked, and topped up the oil, so apart from that I am at a loss.
> Any ideas ?
> Bob
>
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Posted by Peter Neill on December 1, 2008, 2:24 am
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On Sun, 30 Nov 2008 13:46:55 -0000, "Emimec"
>
>> Noticed yesterday that the old J&S 540 surface grinder, which doesn't get
>> used much, was acting strange. When the cross table traverse feed is in
>> use, it slows down the x axis power feed?
>> I checked, and topped up the oil, so apart from that I am at a loss.
>> Any ideas ?
>> Bob
>>
>
Nothing too unusual at all with that.
Hydraulic cylinder speed is a function of flow control, and whilst
pressure in the hydraulic system is constant, the speed will vary with
the volume of oil delivered to the cylinder in a given time.
The cross traverse on a 540 is sub-ported off the longitudinal travel
- it won't work unless this valve is opened first - so in effect it is
'stealing' some of the flow volume from this.
When it slows down a touch all you have to do is crack the main table
valve open a fraction more and the problem goes away.
However, if you already have this all the way open and your table
isn't moving so fast that it tries to launch itself across the
workshop, then you have either a major flow delivery or leakage
problem.
If it's delivery, then the problem may well be in the tank. If this
hasn't been cleaned for a while you may well find that half the
contents resemble jelly more than oil, and this will neatly block the
pickup mesh.
If it's leakage, then the problem will probably be in the cross
traverse rams inside the main valve block, but without stripping the
whole thing you won't know.
Finally, it might be as simple as some air in the system. The system
is self bleeding, but it needs to run for a little while first to
achieve this. The remedy is to set the table to maximum X traverse at
a slowish speed and let this run for a while.
With regard to oil, I use Castrol GC32 which was a little easier for
me to source than Mobil Vacuoline.
Peter
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> used much, was acting strange. When the cross table traverse feed is in
> use, it slows down the x axis power feed?
> I checked, and topped up the oil, so apart from that I am at a loss.
> Any ideas ?
> Bob
>