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Thread: Biax scraper motor repair help.
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23rd May 2018, 01:17 PM #16Most Valued Member
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Hi Eric, using a sliding hammer with a hook on the end is about the only way I know of, to get something like that out.
Hope this helps,
KrynTo grow old is mandatory, growing up is optional.
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23rd May 2018, 02:51 PM #17Pink 10EE owner
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Turn up a nice fitting punch that will fit into the ID of the bearing. Fill the bearing hole with grease, put punch on top and hit it. The grease will pop the bearing out, or at least move it.
Gold, the colour of choice for the discerning person.
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23rd May 2018, 09:10 PM #18Senior Member
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You can also do RC's trick with bread if you don't have any grease spare...
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24th May 2018, 02:37 PM #19
I've used small strips of rag myself and have even heard of people using toilet or tissue paper soaked in oil or grease. If the bearing doesn't have a shield or seal on the blind side, grease by itself may just get forced through the bearing if the bearing is tight. By using something like bread or paper or anything else that will block/clog up the bearing, the hydraulic force applied by the tight fitting pin/punch that RC suggeste will push the whole lot out.
I've done that numerous times in motorcycle gearboxes using the rag strip method.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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24th May 2018, 08:32 PM #20Senior Member
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Looks like a quality job.You know you will have to say what it cost! so the community of scrapers appreciate what we have paid for our Biax's.
Cheers Bruce
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25th May 2018, 12:03 AM #21Golden Member
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The casing that the bearing is in is plastic so I am not keen to pressurize it. So I think the grease is out. The hook idea is basically what I am going to try with a dynabolt or similar device that will expand on the inner bore.
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25th May 2018, 10:07 PM #22Golden Member
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25th May 2018, 11:16 PM #23Most Valued Member
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Businesses have a bad habit of quoting a price and not mentioning GST, making us assume that the price is inclusive!!!
Should always ask "Is that including GST?"
KrynTo grow old is mandatory, growing up is optional.
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26th May 2018, 08:01 PM #24Golden Member
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3rd Jun 2018, 06:32 PM #25Golden Member
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A short update. The brushes I won on German ebay finally arrived as did a set of Chinese blind bearing pullers from ebay. So it was time to make a move on the bearing at the rear of the motor. First step was to unsolder and move the field windings out of harms way (they both measure 9.6 ohms for those interested). IMG_20180603_104157.jpg
This leaves the 8mm ID bearing down at the bottom of a deep narrow casing. IMG_20180603_104152.jpg
I gave the casing a wash out in the kitchen sink telling me the guys on the metalwork forums said it was perfectly fine to do so.
IMG_20180603_104317.jpgIMG_20180603_104413.jpg
IMG_20180603_141630.jpg
I had prepared and bough a set of blind bearing pullers from ebay. As with all things you get what you pay for and the design of these is poor. When you tighten the pin into the expanding outer it is designed in such a way that the expanding outer is unsupported so the "legs" are left springy and end up pulling out of the bearing with even gentle tapping on the slide hammer.
So I resorted to drilling two 3mm holes through the housing at the back of the bearing and tapping it out with a punch. IMG_20180603_141544.jpg
Now I have the bearings out I will procure some tomorrow and put the thing back together.
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3rd Jun 2018, 06:39 PM #26Golden Member
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IMG_20180603_141621.jpgOne more thing. Here is a photo of the parts cleaned and ready to go.
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3rd Jun 2018, 08:23 PM #27
Hi Eric,
I'm very interested in learning more about these blind bearing extractors.
Could you show some close-ups of the ends open and closed and maybe a sketch of the mechanism?
I imagined that there was some kind of taper plug that forced the fingers apart and heald them there in use....
What closes them and what opens them?
This is what I found in a quick search:
https://www.youtube.com/watch?v=5C4KjJ-j3u4 and
https://www.youtube.com/watch?v=eNCKmPPdNqQ
Yours are obviously made differently. Could they be improved?Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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3rd Jun 2018, 11:59 PM #28Golden Member
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The main problem is that the bores in the end and the pins that go into them are parallel. The only thing expanding the legs is the short taper on the end of the internal pin as the parallel part is too large to go through the external part when an appropriately size bearing is in place to be pulled.
IMG_20180603_212548.jpgIMG_20180603_212518.jpgIMG_20180603_212502.jpg
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4th Jun 2018, 01:07 AM #29Most Valued Member
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Hi Eric, thanks for the pics of the tool and tips. Can you see an easy fix for these or is it WOFTAM???
Would you recommend this tool?
Thanks,
KrynTo grow old is mandatory, growing up is optional.
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4th Jun 2018, 09:25 AM #30Golden Member
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Kryn
Not sure yet. In truth both the pins and the bore they expand in should be tapered for these tools to work properly. I can fix the pins easily but boring out something that is slit two ways seems near impossible given the equipment on hand. Especially in the desired 8mm size.
Eric
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