So I recently bought a surface grinder with a ballway table. The table has 20 cylindrical rollers that measure .7498 in diameter and .717 in length from the best I could measure. They all look in good shape just a good cleaning but they do not look like a mirrored surface. Tried looking everywhere I can think of for cylindrical rollers but came up short less calling and having a custom set made. Idk if buying linear bearing shaft and cutting would be precise enough? Well I work with a lot of hydraulics and had a bunch of motors laying around the shop with a bad shaft or a leaker. I ripped one apart and what ya know they have 7 rollers that are part of the rotor Assy. That measure exactly .750 with a length of 2". Different size motors have different lengths for different displacement motors but all are exactly .750 nice polished surface and the perfect material I think for rollers. Here's a pic of them the one in center is a original I'm gonna duplicate.
So my thought was to put the roller in a 5c collet block put the collet block in a vise and use my surface grinder to cut to length. Cut them alittle heavy then surface grind the batch? Then put in the spin fixture a grind the bevel on the ends to duplicate the originals.
My second way and what I'm leaning towards in putting them in my spin fixture that is driven and spin the roller while cutting? I'd be using coolant both ways. I saw acouple videos of people using a cutoff on the SG and they did it in one swipe. I think plunging while spinning the part will be the safest??? Will cutting these rollers down effect the diameters of the rollers??
I really don't need to make these but I figured since I have it apart it would be nice to have some new rollers in there. Then my OCD starts kicking in and thinking why did they only use 10 per guide rail why not 20 you have enough material for it?? I did see a video where robin renzetti rebuilt his grinder and added more balls to his table along with a self lubricating/cleaning retainers which was amazing.
My main question is spin cut verses just a collet block and one swipe cutting? And do you think the diameter will be changed at all with the grinding that will be done to them? For some reason I can’t post pictures says file to large never had this problem before. I’ll get some when fixed
So my thought was to put the roller in a 5c collet block put the collet block in a vise and use my surface grinder to cut to length. Cut them alittle heavy then surface grind the batch? Then put in the spin fixture a grind the bevel on the ends to duplicate the originals.
My second way and what I'm leaning towards in putting them in my spin fixture that is driven and spin the roller while cutting? I'd be using coolant both ways. I saw acouple videos of people using a cutoff on the SG and they did it in one swipe. I think plunging while spinning the part will be the safest??? Will cutting these rollers down effect the diameters of the rollers??
I really don't need to make these but I figured since I have it apart it would be nice to have some new rollers in there. Then my OCD starts kicking in and thinking why did they only use 10 per guide rail why not 20 you have enough material for it?? I did see a video where robin renzetti rebuilt his grinder and added more balls to his table along with a self lubricating/cleaning retainers which was amazing.
My main question is spin cut verses just a collet block and one swipe cutting? And do you think the diameter will be changed at all with the grinding that will be done to them? For some reason I can’t post pictures says file to large never had this problem before. I’ll get some when fixed
