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secretasianman
02-09-2009, 10:00 PM
Another long day and the GK bug which has slowly been biting over the past few weeks is starting to manifest.

Unfortunately I work 10 hour days with a half hour commute each way, prepare my own meals, work out for at least 30-40 minutes a night and still try to get a full night's worth of sleep. That doesn't leave much time for anything else, especially hobbies.

However, I *did* break the seal on Rider by S-MIST over a year ago and am determined to complete that gorgeous medusa even if it kills me.

While sneaking internet breaks throughout the work day I remembered a toothbrush hack known to be used here & there at various modeling sites. Perhaps this can prove to be a time-saving tool?

Here is my first attempt using the "slim" variant of the "Crest Spinbrush" where instead of spinning, the middle group of bristles move back and forth.

http://tellyourfriends.org/rider/toothbrush.jpg

Unfortunately the results weren't as expected. Because I didn't examine the design, I found out the hard way the vibrating component relies on stiff bristles at the foremost part of the toothbrush head for a sort of "recoil" action in order to work. But since I excitedly cut off *all* the bristles down to the brush head, that recoil mechanism was destroyed.

I was able to restore some of the recoil by stuffing part of the sanding sponge in the gap between the vibrating mechanism and the head but it didn't move as firmly and reliably as the toothbrush did before I destroyed it, and only reacted when I pushed the brush one way.

After giving this poor creation the benefit of the doubt and 10 minutes to redeem itself, I decided this was no more efficient that sanding in only one direction by hand, and slowly at that. Of course, that was partly my fault.

I shall revisit this option again after finding a more suitable brush. Unfortunately, at $5 a piece I probably won't be using this kind again as experimentation can get ... expensive.


So...

I am wondering how many of our active readers also employ this little hack, and if it's a feasible time saver once the right brush is chosen ( and what types of brushes yield the best results aka : full moving brush heads, rotating heads, lateral heads, sonic heads etc...)

Thoughts anyone?

Masa
02-10-2009, 12:26 AM
If you wanted to do one of those "back and forth" motion types, you should look into those nail polishers they have in the cosmetics section. Those are much more tough and reliable.

I've built two in the past. Both using the Crest Spinbrush. The first one worked great until the motor burned out. The second one - I retrofitted a Mabuchi Racing Motor from an r/c car and it worked even better, but burned out batteries quickly. I toyed with the idea of fitting an ac adapter to it, but never got around to it.

http://www.gkjapan.com/picture.php?albumid=10&pictureid=120

Then, GSI Creos came out with a production model spinbrush and you know me - I JUST HAVE TO HAVE ONE... and I've been using that ever since. It is not as powerful as the racing motor DIY one I built, but still has more power than the standard toothbrush. The sanding sheets are pre-cut and come in different grits. It is pretty much a clone of the spinbrush, but the biggest plus is how quiet this thing is compared to the DIY variants. Minus would be its a bit heavier since it uses two AA instead of two AAA batteries. All in all, I have no big complaints, it's dirt cheap and time is money ;)

http://www.gkjapan.com/picture.php?albumid=10&pictureid=121

FilmMkr
02-10-2009, 08:34 AM
Lots of good stuff here:

Filmy's Toothbrush Sander Tutorial (http://filmmkr.smugmug.com/gallery/5820378_s47KH#360786590_pHNUy)

secretasianman
02-10-2009, 08:42 AM
If you wanted to do one of those "back and forth" motion types, you should look into those nail polishers they have in the cosmetics section. Those are much more tough and reliable.

For some reason I've always considered the 'back and forth' type the only option, but when I think about it now, I'm sure there are useful applications for various types. It seems to me that the kind where the entire brush head shakes would have somewhat an orbital effect for wide areas and the back-and-forth type would work for long and grooved areas...



I've built two in the past. Both using the Crest Spinbrush. The first one worked great until the motor burned out. The second one - I retrofitted a Mabuchi Racing Motor from an r/c car and it worked even better, but burned out batteries quickly. I toyed with the idea of fitting an ac adapter to it, but never got around to it.


Which variant of the spinbrush did you use? I avoided the one with the spinning bristles for the same reason you don't wax your car with rotary tool.

As for the mabuchi mod... I have plenty of those lying around, or we can go the Tim Taylor route.... just for fun...

http://www.tellyourfriends.org/os15cv.jpg

:lol:

secretasianman
02-10-2009, 08:58 AM
Lots of good stuff here:

Filmy's Toothbrush Sander Tutorial (http://filmmkr.smugmug.com/gallery/5820378_s47KH#360786590_pHNUy)

Looks like I missed your post while typing mine,

As usual you're a man of class and a god amongst men ^_^

Thanks!


edit : Spotted the Oral-B at Walgreen's on the way home today. I know it didn't have to be exact, and I could have continued experimenting but hey, we know it works the charm! (makes relatively short work of epoxy putty too!!!:blink:)

Masa
02-11-2009, 10:18 AM
My Crest Spinbrush ones were the semi-arc type. They didn't spin a full 360 degrees. Never had any problems with them and for the price, you don't have to worry too much about messing them up.

GSI also came out with a "back and forth" motion polisher/sander

http://www.ms-plus.com/search.asp?id=24124

secretasianman
02-11-2009, 07:59 PM
:hehe: Yeah learned the hard way that they don't do a full-rotation... 'coulda saved a few bucks if I asked first ^_^