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13th February 2021, 08:34 PM #1New Member
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Gilbro Super Smoother - What speed ?
I have acquired a Gilbro Super Smoother without stand or motor and want to know what is a suitable safe operating speed.
It has 3 rebating blades, 4½ inch long on 2 inch diameter, 2-piece drum (i.e. the drum is not integral with the spindle).
My concern is the 2-piece drum which is rather thin at the bottom of each blade slot.
Can anyone advise me please ? Preferably by knowledge of a machine with same drum construction.
Thanks, Jim
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13th February 2021 08:34 PM # ADSGoogle Adsense Advertisement
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14th February 2021, 09:48 AM #2
If you read through this thread there are a couple of members who own these and you could contact them through a PM if needed.
If you get to the last reply in the thread it says that the cutter head rotates at 5000RPM.
Some photos in this and this thread that might also be of assistance. It appears that Chesand hasn't been able to sell his so that may be a good help to you.
Post #3 in this thread may be of use down the track.Dallas
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14th February 2021, 10:03 AM #3GOLD MEMBER
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14th February 2021, 02:23 PM #4New Member
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14th February 2021, 05:11 PM #5Taking a break
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Based on the pics in this thread, there doesn't seem to be any noticeable taper in the belt from drive to driven pulley, indicating approximately 1:1 cutter RPM to motor RPM, and motor RPM is 2880
"Antique" Gilbro Super Smoother
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14th February 2021, 05:30 PM #6
Still have it, and moved from one storage situation to another last year so I can get to it now to measure and read data plates. My memory wasn't too bad since I hadn't seen it for 4 years when I suggested the speed previously.
Motor RPM 2850 (3/4HP GMF Cadet double ended, one end drives jointer, the other the saw)
Motor pulley 3.5 inches A section
Super smoother pulley diameter 2 inches A section
So 2850 x 3.5/2 = 4987.5 RPM nominal, will vary with load as the motor speed will also. Measurements and observations from a factory stock Gilbro combo saw and buzzer unit purchased second hand in 2010 from someone I had known for 25 yrs who purchased it new.
I haven't needed to dismantle the jointer to establish spindle size as original bearings are still OK but was aware that the spindle and head were separate units because of the grub screws in the head to lock it onto the spindle. So I have no knowledge of how much or little metal there is between the blade slots and the bore for the spindle. Incidentally there was a super smoother on a factory stand with original motor etc and a big brother 6inch Gilbro jointer (bare bones, no stand or motor) listed on Facebook Marketplace (Melbourne) Friday and Saturday.
Hope this helpsI used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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14th February 2021, 10:38 PM #7New Member
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Good info
Thanks for replies and very useful information.
My unit had poor bearings so I had to completely strip it to replace them.
To date I've run it at ~3200 rpm and all was smooth.
Next steps are to build a stand and set up the drive.
Cheers.
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