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  1. #1
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    Default Biax/Bunax making group project

    As suggested, I decided to start a Thread relating to the group project of making a Biax type powwer scraper.

    I'm not really sure how this group project will progress or what direction it will take but I'm happy for people to provide their own expertise based on their experience of making their own. Also a place for people to express their interest in making one.

    See how it does...

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  2. #2
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    May 2020
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    Willowbank QLD
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    517

    Default

    I am interested two and have no experience.

    I think the first step so everyone is on the same page is to outline some basic parameters.

    These could be along the lines of power or air operation, strokes per minute, length of stroke and such.

    Steve

  3. #3
    Join Date
    Mar 2008
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    nowra
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    1,598

    Default

    I would be happy to assist in making some parts. On the CNC lathe if needed. I don't need one as Ive got a biax. I do need to make blades one day.
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre

  4. #4
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    Nov 2017
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    Geelong, Australia
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    Default

    I'll be in

    In terms of power source - I think 240v electric is the most practical.
    Everyone has a power point (not everyone has a decent compressor to run pneumatic tools), and you can use it all day without running out of battery etc.

    Slap me around the head if I'm overstepping my station - but thought it would be good to get these useful posts from the Biax Info thread to save those members re-posting.

    Quote Originally Posted by jhovel View Post
    I think that's a really good idea. But we would need to buy a bunch of donor machines at the same time. The manufacturers constantly seem to change their models and internal designs. Whatever we come up with for a good group build design, won't be applicable for the next model....
    A good strategy would be:
    • get group build members list
    • buy the number of reciprocating saws required and agreed to
    • jointly design the modifications
    • get volunteers with the right gear and time to make each modification on ALL of them,
      e.g. one person makes the scotch yoke mod, another cuts the dovetail slot in all the drive gears, another cuts out the blade holder arms, another makes the blade holder top, another the blade holder clamps, another does the housing mods etc...
    • then send all the bits to the participating members to assemble themselves...

    An alternative might be to do a group buy of the donor machines, then group design the mods and make detailed drawings, and everyone does their own mod....

    Quote Originally Posted by simonl View Post
    Good ideas there Joe.

    I like the idea of each person assigned to a specific part. So much quicker/easier to set up tooling for one job and do all the same.

    Cheers,

    Simon

    Sent from a galaxy far far away

    Quote Originally Posted by NedsHead View Post
    Count me in on a group buy/build,

    I have a 25x25 Sandvik scraper blade around here somewhere... just waiting for a use

    I can cut out a batch of parts on the water jet at work if it helps
    Quote Originally Posted by Com_VC View Post
    In that case you might be better off buying a known brand from the get go, something such as a Makita who rarely ever change there designs.

    Everyone is buying cordless gear now so these can usually be picked up cheaply.

    Something to think about.

    Sent from my SM-G935F using Tapatalk
    Steve

  5. #5
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    Nov 2017
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    Default

    These Ozito recip saws might be a good candidate:
    $99 retail at Bunnings - Likely we'd get a better price if we bought quantity.

    https://ozito.com.au/products/rsw-5200/

    https://www.bunnings.com.au/ozito-92...g-saw_p6290555

    Specifications

    Power 920W

    No Load Speed 800-3,000spm

    Stroke Length 24mm

    Weight 3.5kg

    Steve

  6. #6
    Join Date
    Jul 2016
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    Melbourne
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    Id be in to help, no handy cnc but I'm a decent operator be happy to do some modifying of existing parts thats suited to manual ops

    Sent from my SM-G973F using Tapatalk

  7. #7
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    Jan 2016
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    Wodonga Vic
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    I had my eye on one of these https://www.ebay.com.au/itm/Cordless...154756-20017-0 purely for the ergonomics, a leather hand strap could be fitted and it might be comfortable to hold and use two handed, Maybe there’s something similar out there that’s 240v and a more trustworthy brand.

    I do kinda like the idea of an 18v unit but that can by tried later down the track

  8. #8
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    Aug 2011
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    Melbourne
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    Ive had a look on both eBay and gumtree for S/H reciprocating saws.

    I do like the look of the Makita JR3050T 240V saw. The parts diagram indicates it uses a Scottish yoke design so is suitable. These can be found S/H for around $100 or so.

    I'm not sure how we go forward with this project, whether we source our own S/H or all buy the same one brand new...

    Edit: rightly or wrongly, I was thinking a 240V corded would be better purely because they may be heavier.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  9. #9
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    Default

    Looks like Makita has replaced the JR3050T for the identical looking M4501KB - so much for Makita not changing their models.....
    However, the new version is only $140 new from CL Tools in Brisbane https://www.cltoolcentre.com.au/maki...cipro-saw.html
    Maybe that's a candidate....

    I did contemplate the idea of a cordless one too. However, unless someone already has the batteries for other tools, then the batteries are expensive and you would need two and a charger (to charge the 1st one while you are using the second one). They would run for quite a long time, as they won't be stressed anything like sawing.... But I agree with Simon, the extra weight of a 240V one would help, as would the variable speed.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  10. #10
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    Athelstone, SA 5076
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    Bunnings has XU1 for $66.00....got one the other day and pulled it apart...bloody loctite...need some new screws to put it together now.

  11. #11
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    Default

    I think we can get hold of lots of cheap reciprocating saws - cheap brands, used ones, old stock etc. But my feeling is that going that route for a group build will lead to tears, since we are wiping the warranty on day 1.....
    Sticking to a reputable brand like Makita is probably safer.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  12. #12
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    Quote Originally Posted by eskimo View Post
    Bunnings has XU1 for $66.00....got one the other day and pulled it apart...bloody loctite...need some new screws to put it together now.
    Assuming they haven't changed their mechanism design, thats just an updated model of the one Bob Ward posted in the Biax Info thread - that he won at a scraping class.
    I'm picking if it worked well enough to be worthy of giving away in that environment, then its going to work for my purposes.

    Any photos of the guts Eskimo?

    Steve

  13. #13
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    Default

    Quote Originally Posted by jhovel View Post
    Sticking to a reputable brand like Makita is probably safer.
    this appears to be there base model @ $150, next model up is $160

    https://www.totaltools.com.au/1010w-reciprocal-saw

    sounds good to me, if the working end are the same people could choose which ever they like

  14. #14
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    Quote Originally Posted by jhovel View Post
    I think we can get hold of lots of cheap reciprocating saws - cheap brands, used ones, old stock etc. But my feeling is that going that route for a group build will lead to tears, since we are wiping the warranty on day 1.....
    Sticking to a reputable brand like Makita is probably safer.
    Good point Joe. I guess its one thing to put a few hours into modifying a cheap one for yourself, but to do a whole lot and then find they all failed due to poor material would suck!

    That genuine Makita M4501KB for $140 is pretty attractive.
    Here's the parts breakdown if anyone can comment on its suitability: https://www.gettoolsdirect.com.au/sp...ating-saw.html

    Edit: the only difference I can see between the KB and the $10 cheaper KG model is the KB has a "Dust and drip-proof design motor and gearing are sealed for protection against dust and water ingress"
    Would seem like $10 well spent...

    Steve

  15. #15
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    Newcastle
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    Quote Originally Posted by OxxAndBert View Post
    These Ozito recip saws might be a good candidate:
    $99 retail at Bunnings - Likely we'd get a better price if we bought quantity.

    https://ozito.com.au/products/rsw-5200/

    https://www.bunnings.com.au/ozito-92...g-saw_p6290555

    Specifications

    Power 920W

    No Load Speed 800-3,000spm

    Stroke Length 24mm

    Weight 3.5kg

    Steve
    I have converted one of these Ozitos to a power scraper. An Oziax perhaps...

    I chose this model due to price and variable speed.

    It does have a balance weight which some recip saws don't.

    I modified it for shorter stroke, about 8mm I think.

    I originally planned to make it variable stroke by milling a dovetail or T slot as some others have done. However the relevant piece material is quite hard and I destroyed a HSS end mill. My dodgy mill is not up to carbide milling in hard material and I don't have carbide dovetail or T slot cutters. So ended up just using a carbide drill to put a new hole for the pin that effects the stroke.

    I have not used it a great deal as yet.

    Will did up some pictures in next few days.

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