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  1. #1
    Join Date
    Apr 2019
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    Adelaide
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    Default 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?

  2. #2
    Join Date
    Jan 2016
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    Wodonga Vic
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    36
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    Default

    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

  3. #3
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    Jul 2006
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    Athelstone, SA 5076
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    4,189

    Default

    Quote Originally Posted by NedsHead View Post
    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
    I think a few have tried buf not too sure on the success

  4. #4
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    Mar 2011
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    Southern Flinders Ranges
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    Default

    Have a look on Ca Lem’s YouTube channel, he built one that appeared to work quite well

  5. #5
    Join Date
    Apr 2019
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    Adelaide
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    Default

    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!

  6. #6
    Join Date
    Jul 2010
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    Melbourne
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    Default

    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.

  7. #7
    Join Date
    Jul 2011
    Location
    Adelaide
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    796

    Default

    Quote Originally Posted by Stustoys View Post
    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.
    I have a Biax it is very heavy. It wouldn't have the needed inertia if it wasn't.

  8. #8
    Join Date
    Mar 2014
    Location
    South of Adelaide
    Posts
    977

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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.

  9. #9
    Join Date
    Jun 2011
    Location
    Australia east coast
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    69
    Posts
    2,675

    Default

    Quote Originally Posted by Stustoys View Post
    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.
    I built one using a lightweight AEG recipro-saw.

    It worked but I never liked it. In the end I bought an old Biax that's single speed but much more satisfactory.

    Be good if there was a decent alternative at a reasonable price that's for sure.

    PDW

  10. #10
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    Oct 2011
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    Norwood-ish, Adelaide
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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

  11. #11
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    Melbourne
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    Quote Originally Posted by lamestllama View Post
    I have a Biax it is very heavy. It wouldn't have the needed inertia if it wasn't.
    Just how heavy?
    The saw I used started out at 3.33kgs and ended up at 5.05kg

  12. #12
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    2,090

  13. #13
    Join Date
    Apr 2019
    Location
    Adelaide
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    Default

    Quote Originally Posted by Michael G View Post
    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
    my motor is 850w. Cannot see it being an issue just as long as the speed is right....just keep AGL a little happier!

    EDIT: 350w is 110v. 230v would be ~700w? Mr Ohm said something about I=VR...........
    Last edited by Mk1_Oz; 14th Jan 2022 at 03:53 PM. Reason: just read linky

  14. #14
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    Oct 2011
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    Norwood-ish, Adelaide
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    Default

    Power would be power. It may draw something 1/2 the current but they would not design a constant current draw machine.

    Michael

  15. #15
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    Default

    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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