Bill Clark
Plastic
- Joined
- Apr 8, 2012
- Location
- Ocoee, Florida
I'm refurbing my old '92 VF-2 and while reassembling and checking the axial play on the x and y ball screws I'm noticing about +- 1 or 2 tenths with 50-75lbs of force applied to the bed/carriage (indicating at the end of the screw). Total backlash is about twice that so half in the ball nut and half, in what I assume is the needle thrust bearings. I did replace these bearings with new Koyo 35x20 and although i dont know how much preload I have on them its enough to create noticeable drag and I wouldnt want to run them much tighter.
My question is if I were to fit 60deg NSK 20TAC47BDDGSUC10PN7BP4 ABEC-7 AC bearings (same OD/ID)to the cartridges would this play be eliminated? Haas says to physically push and pull on the axis and +- a tenth is good. I'm probably getting a bit more than that and although the old girl has been retired to hobby use the anal machinist in me wants it to be the best I can make it. What you say? is it worth a few hundred $ and some machining if it will eliminate half of the backlash?
My question is if I were to fit 60deg NSK 20TAC47BDDGSUC10PN7BP4 ABEC-7 AC bearings (same OD/ID)to the cartridges would this play be eliminated? Haas says to physically push and pull on the axis and +- a tenth is good. I'm probably getting a bit more than that and although the old girl has been retired to hobby use the anal machinist in me wants it to be the best I can make it. What you say? is it worth a few hundred $ and some machining if it will eliminate half of the backlash?