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Author Topic: 18 inch Frantom Saw pulley sizes ????  (Read 505 times)

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55fossil

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18 inch Frantom Saw pulley sizes ????
« on: May 08, 2018, 10:38:24 AM »

   Anyone out there with an 18 inch Frantom that could list the proper pulley sizes????  My saw seems to cut too fast compared to other 18 inch slab saws I have had. I think maybe one of the pulleys may be incorrect. I would appreciate if someone could list the correct pulley sizes:
motor pulley;
main saw pulley;
shaft drive pulley;
triple shaft pulley;

thanks in advance.... love my olddddddd Frantom
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Jhon P

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #1 on: May 08, 2018, 01:11:54 PM »

What is the motor speed? Mine is 1725 rpm
When I get home I will measure them
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peruano

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #2 on: May 08, 2018, 01:31:51 PM »

Rather than trust what's on someone else's saw, I'd figure them out.  The motor and arbor sizes should result in a blade speed that coincides with a mfgr'f recommendation. Now the sled speed is a bit more complicated, but I'd calculate what I had now, and then adjust to slow it down to something in the range of 5 to 10 min per inch.  I've heard that 7 min is reasonable speed, but much depends of what you are cutting, how big it is (i.e. how much rock is contacting the blade), and the quality of the blade you are using.  The HP saws offer three pulley sizes, and I use the slowest configuration at all times.  Time equals blade life and blade life is money saved.  Just another approach.  Then compare with what another saw is configured to run. 
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Combining a love of bikes (pedal and otherwise) with hiking, hounding, lapidary, and the great outdoors

55fossil

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #3 on: May 08, 2018, 06:46:12 PM »

    Jhon;   No rush, but I appreciate it. With some new bearings and clean-up this baby is running nice. No new paint, I like the Rat Rod look.  Motor is 1750 rpm. 

     Peruano:   I agree on the slow speed, except for really soft rocks and obsidian. But the difference between 5 and 10 inches per minute is huge when you max out the rock vice. This Frantom has a new threaded drive rod and clamps from HP so I know those are correct. So stock pulleys should work as long as the drive belt is not slipping.

PS:   While I love my Frantom, I have a 24 inch Covington that just started growling from bad main arbor bearings. I have never had a saw that was so easy to work on. Even taking my time I had the bad shaft bearings out in 30 minutes. Now it will be two weeks while I wait for the new bearings....

thanks all for input.
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Orrum

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #4 on: May 09, 2018, 05:41:18 AM »

Fantom are old saws. I read somewhere that you could speed the blade up on the old ones because modern blades cut so much better. Maybe a previous owner deliberately speed it up with a pulley change? I have a 14 inch in the middle of rebuilding, the folks 9I know claim it's the cats meow!!!
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Jhon P

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #5 on: May 09, 2018, 07:09:23 AM »

 The motor pully is 2 1/4”
The pully on the blade drive shaft is 8”
The pully on the gear drive is 4”/3”/2”
I usually run on the largest for slower speed about 7 minutes per inch. I will shift the belt down to a smaller pully if I am cutting soft rock
This has been a good old saw for $500
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55fossil

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Re: 18 inch Frantom Saw pulley sizes ????
« Reply #6 on: May 09, 2018, 07:08:40 PM »

   Thanks Jhon, I will check it out in the morning. Nice thing about being old and retired is slow seems pretty darn fast now.....  Just like my women, fast used to be good but slow is better now.   Sorry, wife is calling, got to go.......

   Orrum, definitely great saws.....
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