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Thread: Biax scraper motor repair help.
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15th May 2018, 03:17 PM #1Golden Member
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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?
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15th May 2018, 04:43 PM #2Pink 10EE owner
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Gold, the colour of choice for the discerning person.
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15th May 2018, 07:27 PM #3Golden Member
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15th May 2018, 10:37 PM #4
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 changeI used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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16th May 2018, 01:11 AM #5Golden Member
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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.
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16th May 2018, 02:06 AM #6Most Valued Member
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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?
KrynTo grow old is mandatory, growing up is optional.
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16th May 2018, 03:17 AM #7Golden Member
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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
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16th May 2018, 07:41 AM #8Philomath in training
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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
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16th May 2018, 09:29 AM #9Most Valued Member
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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.
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16th May 2018, 12:38 PM #10
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
retired - less energy, more time to contemplate projects and more shed time....
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17th May 2018, 12:46 AM #11Golden Member
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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
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18th May 2018, 10:01 AM #12Pink 10EE owner
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Gold, the colour of choice for the discerning person.
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22nd May 2018, 12:49 AM #13Golden Member
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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
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22nd May 2018, 07:49 AM #14Pink 10EE owner
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Wow that was fast service.
Looks good.Gold, the colour of choice for the discerning person.
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23rd May 2018, 12:06 AM #15Golden Member
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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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