very good video. i have a rcp-20 as well. which tubes did you use for replacement? why did the original pump not work? i tried mine and it seems to work. like to modify my machine as well. thanks !
For the tube I used latex tubes. I used a small amount of silicone to make sure they stick to the connectors because those are not really good at grabbing the tube. For the pump I was talking about the first replacement pump that I used. You can see it on the tensioning plate, it is a small rectangular box in the video. The original pump worked great but it was part of the electric motor, I wanted everything on 12v. You may be able to reuse it, I haven't tried. There is another way to modify the RCP20 by changing just one gear, it could another option.
I’m in the US and couldn’t find the exact motor. I found a similar motor but gear ratio is 250:1. Does that matter? Can you provide a link to where you bought your motor?
It would depend on the initial dc motor speed. The motor needs to have around 106rpm at 12v. The motor I use can go up to 132rpm at 15v if needed. 4.5v :40rpm 6v:53rpm 9v:80rpm 12v:106rpm 15v:132. Or you could change the gears sizes, I made the calculations for mine more than a year ago so can't really help you on that. If you type "MFA 919D1481" on the website rapidonline or farnell, it will show you the motor.
Excellent! You mentioned a 30mm diameter gear with 20 teeth you attached to the motor. Could you be more specific on that one, perhaps even a link? Many thanks!
If you mean how is the pump connected to the chassis, I just drilled holes at the right place and bolted it. I ended up using a diaphragm pump not the small black one you see at some point in the video. For the 3d printed motor mount. I put a link in the description.
This is amazing, thank you very much! I just ordered all the components. Did you use the same belt in it?
Yes, I reused the belt.
very good video. i have a rcp-20 as well. which tubes did you use for replacement? why did the original pump not work? i tried mine and it seems to work. like to modify my machine as well. thanks !
For the tube I used latex tubes.
I used a small amount of silicone to make sure they stick to the connectors because those are not really good at grabbing the tube.
For the pump I was talking about the first replacement pump that I used. You can see it on the tensioning plate, it is a small rectangular box in the video.
The original pump worked great but it was part of the electric motor, I wanted everything on 12v.
You may be able to reuse it, I haven't tried.
There is another way to modify the RCP20 by changing just one gear, it could another option.
I’m in the US and couldn’t find the exact motor. I found a similar motor but gear ratio is 250:1. Does that matter? Can you provide a link to where you bought your motor?
It would depend on the initial dc motor speed.
The motor needs to have around 106rpm at 12v.
The motor I use can go up to 132rpm at 15v if needed.
4.5v :40rpm 6v:53rpm 9v:80rpm 12v:106rpm 15v:132.
Or you could change the gears sizes, I made the calculations for mine more than a year ago so can't really help you on that.
If you type "MFA 919D1481" on the website rapidonline or farnell, it will show you the motor.
Excellent! You mentioned a 30mm diameter gear with 20 teeth you attached to the motor. Could you be more specific on that one, perhaps even a link? Many thanks!
I am going to check where I got it from, I will get back to you and give you a link.
Found it. It is not 30mm it's 31. cpc.farnell.com/mfa/919d9/t5-timing-pulley-20-teeth/dp/HK00940?CMP=i-ddd7-00001003
@@n.defranceMany thanks! Merci beaucoup!
You are a legend!
Hey I have a rcp40 will this be the same handeling
I don't know, I have never opened or used one. I would expect it should be pretty similar for the sake of manufacturing but cannot give any guaranty.
Looks excactly the same as the rcp20 but everything a bit bigger
this is amazing! would love to convert mine to a variable motor now!
Hello were did you buy the new cog
Just checked and the place I bought it from does not sell them anymore.
Rapid online seems to sell them as "timing belt pulley"
Thank you I've purchased the other parts also where do you plug the pump in.
Regards Andrew
For the electric, the pump is plugged on the same 12v transformer than the motor.
And the 3d printed bit
If you mean how is the pump connected to the chassis, I just drilled holes at the right place and bolted it. I ended up using a diaphragm pump not the small black one you see at some point in the video.
For the 3d printed motor mount. I put a link in the description.