Increasing Speed on Trim Saw

[tinker]

Just a stupid question but, I have been wearing out the MK305 Agate Kutter blades on my trim saw, the diamond dressing has just peeled off my last two blades.  I have contacted Brian at Gemcuts and he has been very helpful and has contacted the manufacturers in the US, the first suggested that I was using the side of the blade to cut my stones, which I haven't been doing, I use a dremmel to to this if necessary.  The other suggestion from the Manufacturers was that I was running my blade too slow, currently I have an 8" blade and the motor runs at 1470rpm's, they suggest I run the motor at 3,060 rpm's, but the saw has been cutting fine at this speed for years.  At present I have a 5 in pulley on the motor and a 2" on the drive shaft,  I have had no problems with these blades which I have using for the passed 12 years and except for the last two they have lasted a fair length of time, the last two blades have just delaminated  after about a month of use.  Okay me question is how do I increase the speed of the saw, Brian has told me how to do it but I am not very technically mined when it comes to machines, can anybody assist me in suggesting what size wheels I should be using to make the blade run faster.                                                                                                                                                                     Regards      Tinker(Crash test Dummy)

[Pro-oz]

Is the motor a bit worn and getting slow, does it reach it's recommended speed? or is it not holding speed when cutting. Seems strange after 12 years you have to increase the speed.

[Rusted]

According to an online pulley and RPM calculator you have the speed pretty well spot on, at 3675RPM. I used to do these calculations on the back of an envelope, don't bother these days, everything is online.

https://www.blocklayer.com/pulley-belteng

Sorry can't help with why your blades are wearing out though.

[tinker]

Thanks Rusted, solved my problem