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  1. #31
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    Sep 2009
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    Newcastle
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    Quote Originally Posted by OxxAndBert View Post
    That actually looks like quite a solid design.

    I initially thought that the shaft was only supported by that single bearing on the output shaft (rather than a full length shaft with a bearing at either end), but then realised that the yoke itself runs in the housing so that's the secondary bearing.

    The gear is well supported by 2 bearings on the shaft with a decent spacing between them.
    I can't make out from the photos - are those bearings needle rollers that run on the shaft, or just normal bearing races with the inner race on the shaft?

    Steve
    Steve,

    I was a bit surprised and pleased for the price.

    I can't recall if the bearings for the gear shaft are normal ball bearings or needle rollers. I think ball bearings.

    The scotch yoke pin has a small needle roller bearing.

    My scraper insert holder:
    The block is aluminium. Holds onto the reciprocating shaft via a slit bore (two screws at the top) with added security of a middle screw that goes through a hole on the reciprocating shaft.
    15 degree angle

    20220123_175552.jpg

    The actual blade holder was just quickly bodged up and is unfinished. Hence I am using a shank from a broken PCB drill to lift the back end of the retaining plate so the front edge contacts the carbide firmly.

    20220123_175605.jpg

  2. #32
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    72
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    3,102

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    Quote Originally Posted by racingtadpole View Post
    Lots of talk around tool mass. I’m curious why this matters? I would have thought the operator applied the weight behind the tool to suit. I also know nothing about scraping..
    It's just hard on your arms and joints. If the machine has a bit of mass, then the "recoil" isn't so tiring. My compressed air Biax was missing the mass of the electric motor and was quite uncomfortable, vibrating in your hands.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  3. #33
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    Quote Originally Posted by simonl View Post
    Ok. I took a roll of the dice and bought a S/H Makita JR3050T with a broken shoe for $75 delivered.
    We'll compare notes and photos then Simon. Mine should arrive here tomorrow.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #34
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    72
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    Quote Originally Posted by jack620 View Post
    I have no use for a scraper, but here's my 2 cents worth:

    I worked in the Bunnings tool shop for six months when I was furloughed due to COVID. There's no way I'd use either an Ozito or XU1 tool as the powerplant for this device. Given the investment in time for the conversion and the saving over the cost of a Biax, it has to be worth spending a bit more on a decent quality donor tool.
    I totally agree. I estimate that the life expectancy of most 240V Ozito tools is measured in the tens of hours. That means thousands of 20 second long saw cuts in pine. Not bad. Scraping can take 10 hours at a session. So the tool might last 3,4, or 5 bigger jobs..... Just not worth the effort of modifying.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  5. #35
    Join Date
    Aug 2011
    Location
    Melbourne
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    4,779

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    Mine is taking ages!

    1st - 3rd Feb. Biax/Bunax making group project

    Sent from a galaxy far far away
    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.

  6. #36
    Join Date
    Oct 2008
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    N.W.Tasmania
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    1,407

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    Quote Originally Posted by racingtadpole View Post
    Lots of talk around tool mass. I’m curious why this matters? I would have thought the operator applied the weight behind the tool to suit. I also know nothing about scraping..
    Just imagine driving a rough track in a Lotus Super 7, and then doing a second lap in a car like an S class Mercedes Benz. You might hit all the same corrugations in the Benz, but the mass of the car and its suspension just soaks up the bumps. The difference in the reaction from an exploding bullet as felt from the end of the barrel compared to the stock would be another example.

  7. #37
    Join Date
    Jul 2006
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    Athelstone, SA 5076
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    Quote Originally Posted by jhovel View Post
    I totally agree. I estimate that the life expectancy of most 240V Ozito tools is measured in the tens of hours. That means thousands of 20 second long saw cuts in pine. Not bad. Scraping can take 10 hours at a session. So the tool might last 3,4, or 5 bigger jobs..... Just not worth the effort of modifying.
    that maybe true, but I want to see if it will work before I spend bigger $'s on a more robust machine

  8. #38
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    Oct 2008
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    N.W.Tasmania
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    Originally Posted by jhovel
    I totally agree. I estimate that the life expectancy of most 240V Ozito tools is measured in the tens of hours. That means thousands of 20 second long saw cuts in pine. Not bad. Scraping can take 10 hours at a session. So the tool might last 3,4, or 5 bigger jobs..... Just not worth the effort of modifying.



    eskimo "that maybe true, but I want to see if it will work before I spend bigger $'s on a more robust machine"

    We may all be underestimating the quality of Ozito tools here. Way back around 1990 a builder I knew had lots of Ozito drills and saws, and he claimed to have built multiple homes and units with them with very few failures at that time. He told me that if one was to fail that he would send it back to Bunnings with his wife, if it was still in the warranty period, because he was well known to the staff there as a builder and Ozito were not marketed as professional tools. An added bonus was that they were much less attractive to thieves than high end brands like Makita or Festool, and no more likely to break when dropped or run over.
    If it lasted for 5 big jobs, I would hope that it would no longer be needed by me

  9. #39
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    Melbourne
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    Think there is no right or wrong answer. Comes down to personal choice.

    I'm waiting on a Makita which, according to the photos looked OK. It was advertised as needing a new shoe, which probably contributed to the reasonable price of $60 (+$15 delivery) Since I'm discarding the shoe, it makes it a good buy, perhaps even better than a new Ozito.

    The other thing to consider is even if the Ozito lasts as long, I'm not so sure about the ergonomics or the feel of the tool.

    Many people say the at 1/5 the price, I can replace the tool 4 times and still be ahead cost wise. However, on many occasions you just can't beat the comfort and feel of a more expensive tool.

    Don't get me wrong, I've got some cheapie tool brands in my shed. They are the tools that don't get used all that often and would otherwise be super expensive.

    Just my personal opinion.

    Simon

    Sent from a galaxy far far away
    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.

  10. #40
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    Jul 2010
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    Melbourne
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    Quote Originally Posted by Ropetangler View Post
    If it lasted for 5 big jobs, I would hope that it would no longer be needed by me
    I was thinking the same thing

    I really don't think use as a power scrapper is asking that much of the tool. Sure it runs for a lot of hours but its pretty lightly loaded. When I built mine I really didn't know so I built it with that in mind, drill and tap two holes and everything can be moved to a new unit(assuming they haven't changed things in the meantime).

    I added bearing surface that stops the blade rolling, it's Aluminium running on the black oxide of flat black bar. I have some bronze(ty Phil) for the day when that needs replacing coz "thats not going to last" right? Last I checked all that has happened is the milling cutter marks in the aluminium have been burnished out. I guess in total I have done about "a small lathe"s worth of scrapping but really how do you put a number on that?

    Ergonomics don't seem to matter to much, mine is used upside down and I hold it much like the guy in Joe's Renz R1 scraper picture. But if I was making another one I would certainly put some thought into 3d printing a "horizontal" handle as if nothing else it would make turning it on and off easier.

  11. #41
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    Nov 2007
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    melbourne australia
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    3,228

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    It's also worth pointing out that Ozito were (are?) notorious for switch failures. Perhaps they've lifted their game in that area?
    Chris

  12. #42
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    Aug 2011
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    Personal choice.

    Biax/Bunax making group project

    Sent from a galaxy far far away
    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.

  13. #43
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    Quote Originally Posted by simonl View Post
    Personal choice.

    Biax/Bunax making group project

    Sent from a galaxy far far away
    I'm with you there Simon, if I had acquired a cheap Makita or similar tool for the basis of a home made Biax style scraper, then I would have no hesitation in using it too, but if I had to pay new price of say$320 for the sake of discussion, and my other option was a $50 Ozito, then the Ozito would win the day. If it did toss in the towel, chances are that the modified parts would transfer over to a new one, or some redesigned bits might be tried, but as you say it really is a personal choice we get to make on just how we might go about the project.

  14. #44
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    I agree Rope,

    No way I would have bought a new Makita for this project.

    I mean if it all works out then the $350 is still a cheap scraper, who wouldn't buy a genuine Biax for that price!?

    But yes you do have to factor in the unknown and even then, let's not kid ourselves, even if the project is a success, it's still no Biax!

    These need to be factored in. Truth be told id probably be in the market for an Ozito if I didn't buy S/H. I may still yet!

    Simon

    Sent from a galaxy far far away
    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.

  15. #45
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    Nov 2017
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    Geelong, Australia
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    Just to add another used machine to the mix - a Bosch GSA900 came up on FB just around the corner from home.
    I couldn’t pass it up for $50 - picking it up tomorrow…

    Steve

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