Gallery, Projects and General > The Design Shop
Round belt and flat belt ecological niche and where to get them?
PekkaNF:
Poly-V and PJ-section seems to go under very many names, but I found this site:
http://www.best-drive-belt.co.uk/index.html
and ordered two three rib PJ-section poly-V belt and two 10 mm wide flat belts. Flat belts should be interesting, they should allow 12 mm small pulley and over 30000 rpm and still transmit 0,4 kW no problem. Have to consider centre distance.
I have no first hand experience on small fast flat belt drive. On my milling machine there is about 2" wide, just under 1/4" thick modern spiced belt for slow 3-5 kW motor and about metre centre distance. Crown on the wheels is very small. On grinder there are bits and bobs of ID grinder attachement and smaller wheels have a really pronounced crown. They look pratically like 1" dia miniature old whiskey barrels. I would imagine that modern low strech wheels will need a very small crown if properly lined up. Any opinion this one?
Belt calculators there were very professional lookking and easy to use. They even calculate belt tension and equivialent resonance frequency.
Now I have to find a way measuring 60-100 Hz frequency trough microphone.
Postage was whopping 29€ euros, they probably don't like to get european customers. But because they had multirib, flat nad round belt AND they had a very nice calculator I desided to give them a try.
Pekka
philf:
--- Quote from: PekkaNF on July 27, 2015, 04:42:26 AM ---Poly-V and PJ-section seems to go under very many names, but I found this site:
http://www.best-drive-belt.co.uk/index.html
Postage was whopping 29€ euros, they probably don't like to get european customers.
Pekka
--- End quote ---
Pekka,
They're in Austria so already in Europe.
A nice calculator. I checked my CNC drive on it (5 rib J section; 90 & 45mm pulleys; 5,000 rpm motor; 10,000 rpm spindle) and it looks to be OK to 6.5KW!!! My motor is around 550W at 3,000rpm so the belts should just about be OK. :thumbup:
When I put my slowest pulley combination in (33 & 100mm) and put an input speed of 1,000 rpm I'm still OK with a huge safety factor at 0.6KW total (120W per rib). (I guess at 1,000 rpm my motor is only around 200W.)
The calculator only allows you to select standard pulleys unfortunately.
Phil.
vtsteam:
--- Quote from: PekkaNF on July 27, 2015, 04:42:26 AM ---Now I have to find a way measuring 60-100 Hz frequency trough microphone.
--- End quote ---
Try Visual Analyzer -- it's free to download. I've often used it to analyze the frequency of an engine from video playing on the computer. If your camera can take video, just record your source, and analyze the audio playback on your computer via capture of the output and pipe it to the analyzer.
It works with other people's videos, too. Find an engine on youtube and want to know how many RPM it is running? Check it with VA. :thumbup:
Visual Analyzer:
http://www.sillanumsoft.org/
Sea.dog:
Pekka, Here are a couple of links to suppliers in the UK that do flat belts.
http://www.beltingonline.com/flat-endless-belts-13049
http://www.best-drive-belt.co.uk/flat-belt/flat-belt.PU11.html
Regards
Graham
PekkaNF:
--- Quote from: philf on July 27, 2015, 06:49:16 AM ---
--- Quote from: PekkaNF on July 27, 2015, 04:42:26 AM ---Poly-V and PJ-section seems to go under very many names, but I found this site:
http://www.best-drive-belt.co.uk/index.html
Postage was whopping 29€ euros, they probably don't like to get european customers.
Pekka
--- End quote ---
Pekka,
They're in Austria so already in Europe.....
Phil.
--- End quote ---
My bad! I jumped into conclusions here: http://www.best-drive-belt.co.uk/
VT, I'll have to chek that Visual Analyzer, nice hint.
THANKS for all the responses. Now I have to visit my parents to help on some roof insulation before I return back home and hopefully have the belts waiting for me.
I'll try to grind HSS to 40 degree form tool for J-section pulley. This site did not have those pulleys on stock. Anyway, I probably need to play a little with ratio.
Pekka
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