Questions on lifter bore correction

[Allen Sherman]

Listen to Dwight's advice, the bhj fixtures are about as bad as just leaving the block alone, we have a CNC mill at my shop that we do this job on, can't beat a CNC machine when it comes to exacting tolerances. We only charge $450 though and seeing that others are charging $500-700 to do it on a manual mill I might need to go up on pricing...lol

[Mike Taylor 3601]

Originally Posted by Allen Sherman

Listen to Dwight's advice, the bhj fixtures are about as bad as just leaving the block alone, we have a CNC mill at my shop that we do this job on, can't beat a CNC machine when it comes to exacting tolerances. We only charge $450 though and seeing that others are charging $500-700 to do it on a manual mill I might need to go up on pricing...lol

BHJ fixtures were like hooked on phonics,worked for me.LOL
Allen,
Ten years ago when I did lifter bores w/BHJ we got $375.00 SBC $425.00 BBC including bushings, by time took and bushings was how we come up with those numbers,CNC you can walk away some,manual machine pretty much stuck there.
Mike Taylor 3601

[GallopinGhost]

Allen, Without the fixture, what do you use for a reference, and how do you choose the angle ? thanks

[Dwight Southerland]

Originally Posted by GallopinGhost

Allen, Without the fixture, what do you use for a reference, and how do you choose the angle ? thanks

Factory blueprints and a CNC is the best.

[Allen Sherman]

Sorry I'm slow responding, I don't usually get on here while I'm at the shop, but Dwight answered the question already, we have factory blueprint locations programmed into the CNC, and if needed we just make program changes if an angle or location change is required...

[GallopinGhost]

Thanks guys. Looking at some dated drawings, w/o dimensions no less, The BBM lifter looks to be 90 degrees to the deck, so at least for this block using the crank and cam centerline to swing the angle, then line up with cam centerline should work. I do dimensional inspection work for a living, so I enjoy understanding how this stuff is done.

Originally Posted by Allen Sherman

Sorry I'm slow responding, I don't usually get on here while I'm at the shop, but Dwight answered the question already, we have factory blueprint locations programmed into the CNC, and if needed we just make program changes if an angle or location change is required...

[carl hinkson]

Originally Posted by Allen Sherman

Listen to Dwight's advice, the bhj fixtures are about as bad as just leaving the block alone, we have a CNC mill at my shop that we do this job on, can't beat a CNC machine when it comes to exacting tolerances. We only charge $450 though and seeing that others are charging $500-700 to do it on a manual mill I might need to go up on pricing...lol

I do all my blocks in a HAAS CNC machine and we only charge 275.00 for machining lifter bores LOL. I guess I will have to go up.

[Allen Sherman]

I'm $450 to bore block, install bushings and bore and hone bushings to size

[carl hinkson]

Originally Posted by Allen Sherman

I'm $450 to bore block, install bushings and bore and hone bushings to size

Thats a good deal!!

[Mike Taylor 3601]

How close are Dart's blocks lifter bore locations when you check or machine them on CNC's. I will replace my 3 boring machines with CNC eventually, not sure what brand yet.
Mike Taylor 3601