|
Posted by Richard Ferguson on April 14, 2006, 12:18 pm
Please log in for more thread options
I have a recurring need to reach inside a closed space and grind a weld.
Sometimes I have enough room to get a right angle die grinder in
there, if I distort the shape, but then I have to distort the shape
back, which is kind of a pain. Sometimes there is not enough space to
do that, depending on the size. I use a 2 inch Roloc disk on the die
grinder as a kind of miniature right angle grinder. The headroom
requirement for that setup is 4 inches, more than I would like.
I was thinking that I might make a stationary tool, basically offsetting
the Roloc disk a few inches via a drive belt or chain, to reduce the
headroom required to get inside and grind the weld. The Roloc disk
mounts on a 1/4 inch shaft, so perhaps I could put two bearings and a
pulley on that 1/4 inch shaft, and then run a drive belt to the die
grinder, which would have another pulley on it, using a 1/4 inch shaft
mounted in the die grinder. The sketch at the link below should help, I
always have trouble visualizing what people describe in words, a picture
is worth a thousand words, etc.
http://fergusonsculpture.home.att.net/offset_roloc.jpg
The problem with this concept is that die grinders typically turn at
20,000 RPM. Are there any small drive belts or chains that would
survive that kinds of speeds?
Maybe there is another solution that I have not considered.
Richard
--
http://www.fergusonsculpture.com
Sculptures in copper and other metals
|
|
Posted by mlcorson on April 14, 2006, 12:32 pm
Please log in for more thread options
Richard:
Google Dynafile. I've also seen belt attachments for right angle 4.5"
grinders. Check with your abrasives dealer.
-Mike
|
|
Posted by on April 14, 2006, 12:34 pm
Please log in for more thread options I've used band grinders for close quarters, if there's room enough. HF
has a conversion kit for an angle grinder cheap, if you just want to
try the concept out. I've got my eye on one of the pneumatic dedicated
units, though. The HF unit works well for snagging castings and welds
in odd spots. Just not going to be that long-lived, it's cheaply
built.
Here's one type, there's other sizes:
http://www.use-enco.com/CGI/INSRIT?PMAKA=801-1580&PMPXNO=951639&PARTPG=INLMK3
There's also a pneumatic right-angle micro die grinder:
http://www.use-enco.com/CGI/INSRIT?PARTPG=INLMKD&PMPXNO=952592&PMAKA=801-1685
Both on sale, how's that for timing?
Hope this gives you some ideas
Stan
|
|
Posted by on April 14, 2006, 12:43 pm
Please log in for more thread options At 20,000 RPM, I'd say BELT.
Less stored energy when the chain breaks.
For this you want the smallest pulleys possible to keep the linear
speed down- less stored energy.
20Krpm, 1 inch diameter pulley, the belt's moving at, lets see...
dist at edge = radius times theta, theta is 2pi, 2 x 0.5 xpi = pi
inches per rotation. 20,000 pi is 62831.
So 62.832e3 inches per minute, or 87.3 ft/s or just about 60 mph (which
is 88ft/s).
Not sure a belt will survive turning a tight radius at these speeds.
Maybe a housing with a shaft drive and bevel gears might be found?
You could come straight off the die grinder and just do 1 90-turn at
the head.
Dave
|
|
Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on April 14, 2006, 2:11 pm
Please log in for more thread options
> I was thinking that I might make a stationary tool, basically offsetting
> the Roloc disk a few inches via a drive belt or chain, to reduce the
> headroom required to get inside and grind the weld.
Are you looking for something like this?
<http://www.werkzeugfachmarkt.de/shop.php/sid/x/shp/oxbaseshop/cl/detail
s/cnid/9b64417fdb436eb14.00669661/anid/3e54224fde069aed7.39029057/Winkel
schleifer-MSfv-649/>
The picture at www.fein.com is broken, so you have to live with the
german text. For english description, see Fein's homepage and use this
article number: "MSfv 649"
We call that "long neck angle grinder".
Nick
--
Motor Modelle // Engine Models
<http://www.motor-manufaktur.de>
DIY-DRO // Eigenbau-Digitalanzeige
<http://www.yadro.de>
|
| Similar Threads | Posted | | Speed-up or slow-down belt drive | September 6, 2008, 9:57 pm |
| chain drive lathe | December 10, 2007, 2:05 pm |
| Best lathe: Bushings and belt drive | July 14, 2006, 12:30 am |
| VFDs, belt drive, and a lathe | July 26, 2007, 8:15 pm |
| Old belt drive metal working shop | November 17, 2006, 10:30 pm |
| Rubber for belt grinder drive wheel? | July 17, 2007, 7:41 pm |
| Mini-mill conversion to belt drive, kit available now | March 28, 2006, 8:21 pm |
| Clausing 5400 drive belt removal | March 30, 2006, 12:11 am |
| High speed spindle vibration | October 12, 2006, 10:15 pm |
| High speed Spindle...solved! | October 20, 2006, 12:27 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> the Roloc disk a few inches via a drive belt or chain, to reduce the
> headroom required to get inside and grind the weld.