Just picked up a used 4x36 belt/disc 2/3 HP sander today at the local auction house for 30 bucks. Seen some shop photos you guys post and noticed this type of sander. I'm assuming it has numerous uses. I was wondering what this machine is capable of. I used my 3x18 belt sander mounted in the vice to make my first 2 knives. Until I finish my 2x72 I was wondering if I should try this machine. I'm itching to make another. Is a 4x36 only used on certain things? All info greatly appreciated and thanks to all for your help.