Acetylene420
New Member
When line boring the boom end of a excavator, bucket arms of a loader, or basically any connection which uses press fit bushings, what is the rule of thumb for finish ID bore size?
I’ve always used the thousandths and a half undersized per inch of bushing OD. So if the bushing is 3.000” outside diameter, you’d machine the bore to 2.997” - 2.9955”. Does anyone know if this is correct? I’ve measured bores which only need bushing replacement without line boring and found a range of size variations. Sometimes is a few thousandths and other times it’ll be 10-12 thousandths undersized. I’d like to ask for anyone else’s thoughts and experiences. I’m assuming a bore 10 thousandths undersized would cause distortion to the inside diameter of a bushing when pressed in under that type of under sizing.
Thank you!!
I’ve always used the thousandths and a half undersized per inch of bushing OD. So if the bushing is 3.000” outside diameter, you’d machine the bore to 2.997” - 2.9955”. Does anyone know if this is correct? I’ve measured bores which only need bushing replacement without line boring and found a range of size variations. Sometimes is a few thousandths and other times it’ll be 10-12 thousandths undersized. I’d like to ask for anyone else’s thoughts and experiences. I’m assuming a bore 10 thousandths undersized would cause distortion to the inside diameter of a bushing when pressed in under that type of under sizing.
Thank you!!