Found out my shop's coolant pump was running at half its rated flow for months

I was looking at the manual for our old Haas VF2 the other night, trying to figure out a weird finish issue on some aluminum parts. Buried in the maintenance section, it said the coolant pump should push 10 gallons per minute at 100 psi. That seemed high, so I grabbed a bucket and a stopwatch. I timed it, and we were only getting about 5 GPM. Turns out, the previous guy had swapped the pump impeller for a smaller one years ago and never logged it. No wonder our chip wash was so weak and tools were getting hotter than they should. I ordered the right part and swapped it in yesterday. The difference in chip clearing is night and day. Has anyone else ever found a hidden spec like that that explained a long-running problem?

2 comments

2 Comments

dakota_nelson4311d ago

Ever notice how many problems come from someone quietly lowering the standard? @the_joseph misses that good enough often hides a bigger cost down the road.

the_joseph11d ago

Honestly, that sounds like a waste of time and money. If the machine was still making parts for months, then the flow was good enough. You just added extra wear on an old pump and spent cash for no real gain. Most of those manual specs are just ideal numbers from a lab, not real shop floor needs. Chasing perfect numbers is how you end up fixing things that aren't actually broken.