Proper Torque to Tighten Rail Bolts - Diamond Pro
- Thread starter D Player
- Start date
13 to 15 foot pounds is just right
Zack, how was Sienfeld?
Set it for 15 foot lbs
Seinfeld was great, very funny and better than I was expecting. Im glad to be home from my travels for now and am finally getting to do some good work in my own backyard!
Set it for 15 foot lbs
That's the same torque specs as my wood airplane propeller. Any more and it starts to crush the wood ... I know. :angry: A bit of trivia never hurt.
It translates to enough hold down pressure on a set of Diamond rails as to hold them in place so they can't be moved, the rails sound right when banking balls...and to not cause any damage to the threaded rail bolt inserts, the rail bolts, bolt washers, or the wood around the threaded rail bolt insert.......any thing beyond that....don't matter
:wink:
I am not a mechanic so anybody that takes this reply and goes off and tears up a brand new GCV or Diamond Pro-Am its your own fault.
I work in a building with 500 engineers and this is what I got .... What you're really asking is what is the clamp load. The tension in a typical galvanized 9/16 bolt (3/8 diameter) torqued to 15 ftlbs it is ~2000 lbs. But that is distributed over two surfaces with 1 1/2 inch diameter washers/nut plates. All being being directly proportional to the tension that would give you ~ 1000lbs/sq-inch clamp load.
Re-read paragraph 1. I follow this forum for fun, entertainment, and to make my own table better. My pool table, I just tighten them till they feel "right", making sure not to crush the wood around the nut-plate slots. My propeller is 15 ftlbs because Sensenich Propeller Company says so. I forgot one time and used metal prop torque specs (25 ftlbs) and messed up a $1300 wood prop.
I work in a building with 500 engineers and this is what I got .... What you're really asking is what is the clamp load. The tension in a typical galvanized 9/16 bolt (3/8 diameter) torqued to 15 ftlbs it is ~2000 lbs. But that is distributed over two surfaces with 1 1/2 inch diameter washers/nut plates. All being being directly proportional to the tension that would give you ~ 1000lbs/sq-inch clamp load.
Re-read paragraph 1. I follow this forum for fun, entertainment, and to make my own table better. My pool table, I just tighten them till they feel "right", making sure not to crush the wood around the nut-plate slots. My propeller is 15 ftlbs because Sensenich Propeller Company says so. I forgot one time and used metal prop torque specs (25 ftlbs) and messed up a $1300 wood prop.
The torque varies depending on what kind of table and what kind of rail bolt fasteners are uses. For example, Olhausen uses a 5/16" rail bolt going into a zink T-nut with 3 prongs to hold it from spinning in the rail, while other tables use a stamped out washer plate mounted with 3 wood screws into the rail to hold it in place, then a threaded hole in the center is what the rail bolts thread into.
Sure John....just as soon as YOU go to every table manufacture that has ever built a pool/billiard/snooker table....and make them go back and change every rail they've ever built through out history....to the exact same system of bolting down the rails....THEN....one size would fit all....otherwise....all you're doing again....is starting your shit with me!
Same as a Diamond, 15lbs:smile:
Of the 4 engineers (mechanical and civil) I ran this question by with the parameters I posted, all agreed that the torque specs "would" depend on the "wood". It stands to reason then that there is no one torque value that would apply to all tables.
A quick internet search found a website that says to tighten rails until "snug". Another says to use "light to medium torque"??? Another says when you "hear wood cracking they're too tight"
These site were generic pool table sites, not any particular brand.
A quick internet search found a website that says to tighten rails until "snug". Another says to use "light to medium torque"??? Another says when you "hear wood cracking they're too tight"
These site were generic pool table sites, not any particular brand.
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