Unimat 3 power feed attachment (#150.300) modification #U3accesory #unimat3
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Hello:
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This is a (sort of) followup to this post.
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I went looking and found what I had started working on (more than a year or so ago) while I waited for parts and assorted tools to continue with my U3's much needed rework, which is still in progress. Like a visit to your odontologist: you know when go in but not when you'll leave.
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What I had in mind was using the existing OEM accesory (that expensive little thingy ... ) but driven by an independent 12/24v DC motor with fwd/rev PWM control. A simple solution to the 'twirl around the handle' hassle involved in moving the carriage away when not turning with a tool.
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It would still use a belt (preferably round) but it would be of a larger size and section so it would (hopefully) not stretch or slip like the OEM spec o'rings used from the factory.
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The photos attached are just a proof of concept, a general idea to improve upon and share with the board.
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Notes:
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1.
The mounting plate for this mock up was made from scrap galvanised steel sheet.
The original one will be replaced with a larger one made from 4 or 5mm laser cut steel plate.
The final dimensions and shape of the new mounting plate will become clear when I know what the driving pulley looks like and the exact motor used.
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2.
This U3 accessory is notoriously difficult to take apart to clean and grease.
If you plan on taking it apart, have a close look at the exploded view I am attaching (from the U3 manual).
There are a few things that will be lost if you don't. eg: parts 9, 10 and 11
Don't ask me how I know that.
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3.
You may notice that the hole through which the knurled knob used to engage / disengage the power feed has been enlarged.
It has been done so that it can pass through the mounting plate by just undoing three screws.
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This is needed to be able to take the mechanism apart without having to remove a pin to then remove the knob to then remove the shaft and so on.
ie: to avoid all the hassle involved.
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But don't look for it in the exploded parts diagramme as it is not numbered.
You can see it to the left of the gear in the main axle.?
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Eventually, a thin rubber/silicone something can be put in place between the gear and the mounting plate if grease starts to come out while in use.
But if hard white/yellow grease (B&D power drill gear stuff) is used, it should not happen.
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Comments / suggestions welcome.
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Best,
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JHM |
