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Thread: Biax Scraper Info
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12th Jan 2022, 08:04 PM #1Golden Member
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Biax Scraper Info
Does anybody know what speed a Biax scraper blade oscillates at? Never seen one in the flesh and do not want to sell a kidney to buy one
What watt size motors do they tend to have?
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12th Jan 2022, 08:42 PM #2Golden Member
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No idea, but maybe a variable speed reciprocating saw could be adapted, they have enough torque to cut so I would think they’d have enough to scrape, and they come 18v cordless
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12th Jan 2022, 08:58 PM #3Most Valued Member
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12th Jan 2022, 09:04 PM #4Most Valued Member
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Have a look on Ca Lem’s YouTube channel, he built one that appeared to work quite well
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12th Jan 2022, 09:18 PM #5Golden Member
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OK you caught me.......I am thinking about building one BUT mine will be a Biax copy so will have the correct stroke adjustment built in. I am just looking at motor speeds versus SPM in order to determine the reduction gearing necessary.
Found a couple of references that range from 600 to 1900spm. The all powerful RK posted that he never uses above 1200spm and several have referenced using lower SPM whilst learning.
I have a variable speed Ozito motor (my experience with Ozito is that their gear is not all that bad, at least on the motor side) that is 11,000 to 32,000 rpm. If I aim for 500 to 1450spm then I will need an overall reduction off 22:1.
Long way to go as only just starting to CAD this up. Might end up being another project that doesn't get finished but I enjoy learning (and relearning) TurboCAD and it stops me watching trash TV!
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13th Jan 2022, 12:15 AM #6Most Valued Member
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I built one with a Oztio reciprocating saw.
Seems to work just fine. Marco tried it and his major complaint was it was heavy but I put 0 effort into making it light. I could certainly take some weight off it but I haven't bothered as I have a spring balancer reel and was expecting to have to make a version 2 or at least mods to version 1, but it hasn't been necessary. I bought a second saw "in case" and built it so little work needs to be done(drill and tap two holes from memory) to move all my bits to the replacement saw.
https://metalworkforums.com/f65/t142...-power-scraper
I could likely find any pictures in the morning if you need them.
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13th Jan 2022, 01:32 AM #7Golden Member
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13th Jan 2022, 06:26 PM #8Diamond Member
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I can fish my coborne power scraper out the shed and check it on the weekend if you want. I have often wondered why nobody has made a cheaper copy, I would have assumed the patents would have expired by now.
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13th Jan 2022, 09:46 PM #9Most Valued Member
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14th Jan 2022, 06:42 AM #10Philomath in training
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Variable speed ones are up to 1900 strokes/ minute. Fixed speed is 1400 strokes per minute.
Power varies beetween 300 and 350 watt, depending on model.
Taken from manufacturer's literature found on line
Michael
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14th Jan 2022, 09:06 AM #11Most Valued Member
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14th Jan 2022, 10:38 AM #12Most Valued Member
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Good summary here: http://www.nctoolservice.com/pdfs-da...axScrapers.pdf
Steve
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14th Jan 2022, 03:51 PM #13Golden Member
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Last edited by Mk1_Oz; 14th Jan 2022 at 03:53 PM. Reason: just read linky
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14th Jan 2022, 05:49 PM #14Philomath in training
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Power would be power. It may draw something 1/2 the current but they would not design a constant current draw machine.
Michael
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15th Jan 2022, 06:51 PM #15
They are made in Germany, where they have 230VAC.....
I have an old fixed speed (1400rpm) one and it's only 180W... I use it with an SCR speed controller.
Also, I built one from an Aldi recipro saw before I bought this one. It is still in regular use as well.... Seems like there are hundreds if not thousands of DIY power scrapers around. Made from all kinds if machines (sawzalls, jig saws, electric knifes, Bosch Feinsaegen, DIY scotch joke and gear arrangements.... ) and most report that they work fine. Some are too heavy and some are too light.... I had a BIAX with a compressed air motor which was a LOT lighter than the electric ones, but the balance seemed all wrong. So even BIAX gets the weight wrong....Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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