slew gear? bearing?

[cyanide]

I am planing a truck mounted crane and am wondering what I could use as a turntable, or slew? I do not have the gear or skills to machine my own gears.

I was going to use the head off a grinder.
http://www.steelrats.com/builds/crane/grinder_head.jpg

Will it be strong enough?

I was thinking of using a Lazy Susan bearing maybe?. Bicycle gears and chain?

What do other people use for their cranes or excavators?

[9W Monighan]

Check this type of bearing. These thin bearings would work nicely for modern style cranes and excavators.
http://www.ebay.com/sch/Business-Industrial-/12576/i.html?_trkparms=65%253A10%257C66%253A1%257C39%253 A1&rt=nc&_nkw=kaydon&_dmd=1&_sticky=1&_sop=15&_sc=1&_trksid=m194&ssPageName=STRK:MEFSRCHX:SRCH

[doodlebug]

Look at Izzul's komatsu build, he had a neat bearing/gear combo.
Hope this helps.
Cheer's, Neil.