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  1. #1
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    Default Biax scraper motor repair help.

    Here are some photos of the armature from my Biax 7ES. I don't really understand how it is so stuffed when the rest of the scraper shows absolutely no signs of wear.
    IMG_20180515_123108.jpgIMG_20180515_122936.jpgIMG_20180515_123030.jpgIMG_20180515_133943.jpg
    This did run albeit quite poorly when I acquired it a couple of weeks ago. I only noticed the missing segment when I came to have a look at the brushes.

    As you can see there is a segment missing and the two either side of it are really chewed out. I am willing to spend some money to fix this. Ideally a new armature would be the solution I understand it is a fein motor but without a part number they claim to be unable to help. So the next best option is to find someone in Australia with the skills to rebuild this. Does anyone have any suggestions?

  2. #2
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    Aug 2008
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    Quote Originally Posted by lamestllama View Post
    Here are some photos of the armature from my Biax 7ES. I don't really understand how it is so stuffed when the rest of the scraper shows absolutely no signs of wear.
    The rest of the machine is built to last a long long time.

    The armature on mine was stuffed when I got it as well. I think I found one of the only few second hand armatures in existence, although it needed to be rewound.
    Gold, the colour of choice for the discerning person.

  3. #3
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    Quote Originally Posted by .RC. View Post
    The rest of the machine is built to last a long long time.

    The armature on mine was stuffed when I got it as well. I think I found one of the only few second hand armatures in existence, although it needed to be rewound.

    Did you manage to find any identifying part numbers? Mine is devoid of any part numbers whatsoever.

  4. #4
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    Oct 2007
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    Alexandra Vic
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    If it's any help, Joe Hovel had a thread a couple of years ago about converting an air powered Biax to electric by grafting in a motor from an Ozito multi function tool. The process worked well, but the armature was damaged during assembly. The project was basically a successful proof of concept exercise, but did not continue to a permanent solution due to a lack of Ozito spares to fix the motor. However virtually all major tool manufacturers have MFT's with parts support for around the $200 mark, and some of the low support units are in the order of $50-$100. Could be a worthwhile fix to consider.
    Biax motor change
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  5. #5
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    Default

    I have read that thread. I probably have the possibility of grafting a new commutator on this shaft and having it rewound. Joe didnt have that option. One thing I am noticing is that the Fein nibblers have a very similar looking geartrain to that of the biax. With a spiral pinion on the end of the motor shaft. Maybe a graft of a modern Fein power tool might be the go.

    Quote Originally Posted by malb View Post
    If it's any help, Joe Hovel had a thread a couple of years ago about converting an air powered Biax to electric by grafting in a motor from an Ozito multi function tool. The process worked well, but the armature was damaged during assembly. The project was basically a successful proof of concept exercise, but did not continue to a permanent solution due to a lack of Ozito spares to fix the motor. However virtually all major tool manufacturers have MFT's with parts support for around the $200 mark, and some of the low support units are in the order of $50-$100. Could be a worthwhile fix to consider.
    Biax motor change

  6. #6
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    May 2011
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    Check out the Bosch Die grinder, they look to be similar.
    https://www.gumtree.com.au/s-ad/redc...nty/1182893348

    https://www.gumtree.com.au/s-ad/nedl...er-/1174893422 $100.00

    https://www.gumtree.com.au/s-ad/guil...der/1145552652 $195

    You might find even a 4" angle grinder body might fit?

    Kryn
    To grow old is mandatory, growing up is optional.

  7. #7
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    Adelaide
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    Kryn,

    I am looking at the Fein range simply because i hope they will already have the 6 tooth spiral gear built into the motor shaft as per the original which is also a Fein motor. Hoping they kept that common across a few tools.

    Eric

  8. #8
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    Oct 2011
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    With that sort of damage, you may be better addressing your questions to professionals. I have used the guys listed below in the past for motor repairs, and have had a good job done. The 7 is a current production model I think, so the option is open to contact Biax in the US and ask them about a spare part. It will probably cost but at least you know that it is the right part and not a maybe/ maybe not fix.
    The chewed up bits on either side are because the carbon brushes have knocked on the edges of the missing piece. To fix the armature you would need to make up a replacement copper segment, attach it electrically and then mechanically (Araldite or a similar glue I would suspect). Last of all you would need to do a skim cut on the whole commutator to smooth everything down. It could be done and if it were a motor where parts were simply not available at all, I'd have a go. As it is, I'd try the motor repair place first and then Biax before going there.

    Michael


    STATEWIDE ELECTRIC MOTOR CENTRE

    7 Beulah Road, Norwood,
    South Australia 5067
    P 08 8362 5755

  9. #9
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    Jul 2016
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    I think some metabo jigsaws have exactly the same drive motor and output as at least one Biax model I dont know if it's the 7es though.

  10. #10
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    I believe Michael is right in that a motor rewinder will be able to help. They will have commutators too. No need to find that yourself I suspect. However, make sure the rewinders have access to proper balancing gear - some don't. At 30 000 odd rpm, that is critical.
    The current equivalent Biax models are the BL10/HM10 - neither Dapra nor Schmid & Wezel have spares for the 7 series any more.
    I am NOT sure they used a Bosch motor for the 7 series - it may well have been a Fein motor... I got my intormation form this this source:
    Information on BIAX type 10e?
    Maybe e-mailing Schmid & Wezel in Germany might give you the definitive answer.
    Cheers, Joe
    again completely retired - more time to contemplate projects and spend more shed time....

  11. #11
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    Michael

    The BIAX is a 1970s version with no spares available. I did indeed consult a motor rewinder today and the happy news is it can be repaired. He is sending it to Melbourne because whilst he can rewind it he would have to have it balanced elsewhere whereas the company in Melbourne has machinery to do both jobs. So it is having a new commutator fitted then a rewind. The price is more than I paid for the scraper but still worthwhile considering it should then give years of service if correctly cared for.

    I have to admit I was hoping for an answer like "an armature from a Fein drill or some other tool will fit" or even the exact model number of the Fein flange mount motor used(they provide them to specialist tool manufacturers as a basis for a tool) which would have been some help getting assistance from Fein who promise they will always have an alternative part.

    There really wasn't enough meat in the remaining segments to take a cleanup cut that would have cleaned up the segments adjacent to the missing segment. Even if a segment could be glued in and it was appropriate to the wire to the missing segment was also snapped of. Starting from a clean slate is the right thing to do with this part.

    Eric

  12. #12
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    Quote Originally Posted by lamestllama View Post
    Did you manage to find any identifying part numbers?
    No, no numbers anywhere. Look slike you have got it sorted. I take it you are getting it rewound to 240V if it is 110V at th emoment.

    You can also date your biax by the serial number. The last 2 digits should be the year of manufacture.
    Gold, the colour of choice for the discerning person.

  13. #13
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    I got the armature back from the rewinder. New commutator and rewind are obvious but I cant see any signs it has been rebalanced other than what is written on the bill. Hopefully when the brushes arrive from Germany this thing will go back together again and provide years of service.
    IMG_20180521_224614.jpgIMG_20180521_224622.jpg

  14. #14
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    Wow that was fast service.

    Looks good.
    Gold, the colour of choice for the discerning person.

  15. #15
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    Quote Originally Posted by .RC. View Post
    Wow that was fast service.

    Looks good.
    Yes the turnaround was impressive. It apparently went to Melbourne to someone called Terry who has a machine that can wind and balance these small armatures. Dropped it of with David Osman at Marion on Wednesday afternoon and got it back on Monday afternoon. I can't tell you how well it works yet as I am waiting on brushes from German ebay that have only been in the post since last Monday.

    I also have to figure out how to pull an 8mm id bearing that is in a blind hole at the back of the motor. I am wondering about a modified dynabolt unless I suddenly walk into someone with a blind bearing puller that fits.

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