Re: Ryobi Bench Top Grinder ?? In Sync??

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "tmoore by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tmoorezz-at-adelphia-dot-net>

Hi Ryan and the list,

     I just finished my SRSG, I haven't used in tesla coil service as of yet
but I plan I on very soon. I used the same ryobi bench top grinder except
mine was gold and I got it from home depot as well. What you have to do is
make the motor sailent ploe synchronous this can be accomplished by grinding
4 flat spots on to the armature.

     My rotary disk is constructed of 0.5" thick Plexiglas by 8.5" and has 12
electrodes for 720bps. each electrode weights 1 ounce each, it takes about
10 seconds to spin up to full speed when full power is applied. There are 2
stationary electrodes in the front and an Al ring on the back to connect all
12 electrodes together. I also have a safety gap 2 angle brackets facing
each with 0.25" carriage bolts.

     I have a few questions.

How do you tell if the SRSG is in sync?

When I ran my SRSG and it gets to full speed and I used a 15/60 nst it will
jump across the safety gap up to one inch this is not a needle gap so why is
it jumping a safty gap 4 times wider than it should be able to???

How should I set my safety gaps?

Also if I use a variac to power my SRSG will it come in to phase at
different voltages?

What is the Ideal topload formula?

Thanks!

Nolan Moore


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, May 19, 2003 7:11 AM
Subject: Ryobi Bench Top Grinder ??


 > Original poster: "Lannis, Ryan (Ryan) by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <lannis-at-lucent-dot-com>
 >
 > Hello All,
 >
 > I want to build a new Spark Gap, I have been considering a
 > Synchronous Spark Gap.  I was looking for a cheap motor when I thought of
 > Bench Top grinders.  Home Depot sells a cheap $40 Ryobi 6" grinder that
 > claims to run at 3600 RPM, here is a link.
 >
http://www.ryobitools-dot-com/product/product.asp?prodid=136&prodcat=4&toolcat=3
 > Does it seem odd that the grinder motor runs at 3600 RPM?  By using two
 > spinning disks, would this help quench the Spark Gap better than one
 > spinning and one or more stationary gaps?
 >
 > Does anyone see a problem with using this?  Is Axial play an issue
 > with bench top grinders?  I was considering using Lexan for my disk, I
know
 > it my be a little more expensive than other materials but it looks real
 > nice!  Is there anything I should keep in mind?  I was told to calculate
the
 > weight (in pounds) of a piece of Lexan use (0.0433 * Volume).  6" disk -at-
.5"
 > thick = .6 pounds (without electrodes, without shaft hole computed).  6"
 > seams a little small to me should I go bigger?
 >
 > One more thing, What makes tungsten electrodes so desirable?  It
 > seams that they wear rather quickly.  There is a great example of wear on
 > Terry's web site http://www.tb3-dot-com/tesla/hugecoil/powerup2/powerup2.html.
 > Why not use stainless steel?  Does it get too hot?
 >
 > I know the knowledge is out there.
 > Thanks for reading.
 > Ryan Lannis
 >
 >