Thread: Ryobi HBS 9000 Bandsaw

I saw one of these in a local Cashies cheap, so I thought I'd pick it up.
Have been thinking of modifying one to cut Ali on. I already own the 3 wheel model and I always wreck the blade by using to cut Aluminium.

A quick inspection reveals it use toothed pulleys to get a blade speed of ~738 m/min. This seems easier to modify than the 3 wheel model as that one uses direct drive of the pulley.

Not sure what I'll do yet....fit a new pulley and/or fit asmall 3 phase motor and a VFD.
I think it needs to slowed down to between 122 - 305 m/min, from Google.

Should be fun.

Steve

https://photos.app.goo.gl/URngNL74xmc17LdG8

https://photos.app.goo.gl/v9sCNjpM26rYWJvJ9

Originally Posted by Sterob

...A quick inspection reveals it use toothed pulleys to get a blade speed of ~738 m/min.

Are you sure about that? - that seems ridiculously fast. Wood is cut at around the same speed as Al, so I would expect around 100 to 150m/min off the top of my head.
If you have a digital tacho, try putting a mark with white paint pen or similar and see how many revs the blade is doing. RPM x blade length should be m/min.

Michael

Originally Posted by Michael G

Are you sure about that? - that seems ridiculously fast. Wood is cut at around the same speed as Al, so I would expect around 100 to 150m/min off the top of my head.

738 m/min is on the slow side for wood.
Most WW bandsaws are two speed and typically offer 500 and 1000 m/min. Dedicated resawing BS will go to 1300 m/min. The most efficient hood cutting speed is around 1600 m/min but above about 1300 m/min some form of band cooling is required which can make a mess and the blade wear increases.

My WW bandsaw has a VFD on it but I usually don't bother adjusting the speed while cutting Al and often do this while its doing ~1000 m/min BUT I use lube, either meths or wax. Without the lube the blade galls and it would overheat and break.

Efficient cutting of Al is best done using a negative rake toothed blade I have these for my table saw and Mitre saw and they cut Al very easily and with a fantastic finish.

Originally Posted by Michael G

Are you sure about that? - that seems ridiculously fast. Wood is cut at around the same speed as Al, so I would expect around 100 to 150m/min off the top of my head.
If you have a digital tacho, try putting a mark with white paint pen or similar and see how many revs the blade is doing. RPM x blade length should be m/min.

Michael

I think so. I used the motor speed, the pulley ratio and the diameter of the blade wheel to work it out.
Motor is rated at 1475 RPM. Drive ratio is 3:2 so pulley speed is 980 RPM. Drive pulley dia is 240mm so Circumference of the drive pulley is 750mm. ( 240 x pi )
Blade speed = 980 x .75 m = 735 m/min.

Steve


PS Anybody got a PDF of the Manual please?

Originally Posted by BobL

738 m/min is on the slow side for wood.
Most WW bandsaws are two speed and typically offer 500 and 1000 m/min. Dedicated resawing BS will go to 1300 m/min. The most efficient hood cutting speed is around 1600 m/min but above about 1300 m/min some form of band cooling is required

I'll have to take your word for it, but 1300m/min by my calculation is something like 80km/hour...

Michael

I'll have to check it again using a different way.
I've got a tacho somewhere. Can check the speed of the blade pulley and go from there.

Steve

Originally Posted by Michael G

I'll have to take your word for it, but 1300m/min by my calculation is something like 80km/hour...

Michael

Have a look at the specs of this really nice one - 1200 m/min.
https://www.felder-group.com/en-au/p...c-line-p144120

Originally Posted by Michael G

I'll have to take your word for it, but 1300m/min by my calculation is something like 80km/hour...

Michael

80 Kmh is around what a chainsaw runs the chain while cutting at at as a matter of interest, (free revving is over 100 Kmh). The rule of thumb used to be 10,000 Ft/Min for circular saws which is a shade over 3000 M/min.
Possibly explains why they remove errant digits so readily

Originally Posted by BobL

Have a look at the specs of this really nice one - 1200 m/min.
https://www.felder-group.com/en-au/p...c-line-p144120

Hmmmmmm...Hammer....