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RV Hardware / Re: intermittent "arm board not detected"
« Last post by Mike on April 11, 2018, 12:32:32 AM »
Probably RS232 port issues, as the arm board is read via the serial port.
Try the armtest program - this continually reads from the sensors - run this and systematically wiggle cables. 
If your machine uses serial ports on the DSP carrier card it could be there as well, and maybe also the power supply to the arm PCB
RV Hardware / intermittent "arm board not detected"
« Last post by spiyda on April 10, 2018, 11:28:54 AM »

Someone has asked me if I know the possible reasons for a problem with their vacuum pump intermittently stopping and then a message coming up with “arm board not detected” when a job is loaded in rvplace. ( I think he is registering on the forum )

Oddly enough last week I had a similar issue..  at the end of a long run of placing ( lonfg for me, about 5-6000 components)
 "arm board not detected" followed by "z axis switch not found", happened several times.. ( I then changed the "Z" axis switch, but haven't run it since)

What are the most likely causes of the "arm not detected" error?

RV Hardware / Z axis opto switch calibration
« Last post by spiyda on April 01, 2018, 01:58:07 PM »
I just changed the opto switch on my other machine and found a way of setting the position that seems to work ( on the RV4s at least)

( part number Omron EE-SA105    Mouser   653-EE-SA105 )

run the armtest program on the pc ( no need to have the main power on)

lift the "Z" axis until the number showing for "Analog 2" starts to change ( the mirror will flip down)

estimate the thickness packer you need between the mirror follower bearing and cam shaped lump of the Z axis it runs on to keep it in that position  ( on mine a bit of 1.6mm FR4 worked a treat, but this may vary  )

add just a little more packing and the "Z" axis should sit there with the "Analog 2" readout showing something between 10 and 255

Now you can remove the opto switch and fit the new one.. adjust it til the number reads the same as before.

Job done, time for a cup of tea !
I went to the site where the RV4s machines are. I managed to buy an oven and the machines were still there. They actually come with feeders which was not shown in the original pictures. The feeders all looked to be very clean and in good condition. They will not sell the feeders separately and will split the feeders evenly between the two machines. They said they had some offers but not really sure as they would have sold them I reckon. I think someone could offer 1k and get a machine with feeders.

Sorry I did not take pics. only thought about it afterwards.

RV Hardware / Re: Nozzle fabrication/ordering (Nov '17)
« Last post by alanambrose on March 27, 2018, 04:34:17 PM »
Hi Mike, sorry to be slow replying - I've had a virus. The latest ones were actually done on a formlab. The little bumps are where the supports go and were clipped off. I only just twigged recently that the resin process needs the part to be held at an angle so the non-lasered / non-hardened resin runs off. Hence the asymmetric nature of the bumps and 'laminations'. As well as some gentle fettling, from memory, my formlabs trials still needed drilling out - claimed 3d printing accuracies are to my mind largely bs. Tool 1 to take a brass sleeve here: 1 for brass sleeve.stl

The x-section, designed to make drilling easier, is here:

I have at times been successful drilling both from the top and the bottom, but it's a process that could be improved.

RV Hardware / Re: O-Rings, Drive belts etc
« Last post by Mickyblueeyes on March 26, 2018, 11:45:54 AM »
Hi Ref  the plastic tape grip problem, I had a lot of this when I first used my RV4s  but I found my problem was a mechanical problem with the feeders please see my earlier post
RV Hardware / Re: Nozzle fabrication/ordering (Nov '17)
« Last post by Mike on March 24, 2018, 04:58:55 PM »
I've just done a job where my customer produced some parts using their Formlabs SLA printer - judging from these, I think nozzles made this way could be viable - do you have a file for a nozzle that I can get them to try printing?
For Sale/Wanted, Suppliers / RV1S in darkest Dorset
« Last post by coastelectronics on March 22, 2018, 04:17:11 PM »
I am selling my RV1S plus lots of feeders (total of 8) and several (paid over £1000 for them) W Technology replacement boards including a brand-new DSP board.....the lot for £ offers, buyer collects and don't ask me to demo it.....I've forgotten how to drive the thing. You would also be welcome to various jigs (again by W Technology) and PC spares...motherboards etc etc. I guess this would best suit someone who already has, and uses, another they don't need to do the learning curve. Call me....Graham Coast on 01202 244309 or email
RV Hardware / Re: O-Rings, Drive belts etc
« Last post by Greasemonkey on March 22, 2018, 11:56:00 AM »
I know this is an old sticky, but thought I would add some useful information.
I have recently been trialling some new belts for feeders.
For us the best belts are presently the silicone ones.
They grip the best and also don`t break down in sun light.
Presently we are using 2.62mm x 82.22mm
These were supplied by
Silicone 70 FDA O-Rings BS102 to BS178 Cross Section 2.62mm - BS152S70FDA SILICONE70 FDA 82.22 x 2.62mm RED .
Less than 30p a piece plus P&P.

I have also just ordered some more which are 2.62mm x 75.87mm
I will post after i have tested these smaller belts.

I hope this is useful for someone.
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