I'm interrupting my work to make a separate post about a tool.
I have to admit..... I was astounded. Hence this post.
Time to add the railing that goes to the ladders. The Kumata model has ladders, but no railing.
To do this, I need to make a small cut in the walkway on either side of the ladder.
In order for you to fully appreciate what you are about to see, let's review from the previous EP-2.
I had three wheels for doing this.
The left ceramic cut-off wheel measured at 40 mil.
The middle wheel measured at 21 mil. Better.
The right wheel is a diamond dust impregnated steel wheel.
It measures 5.5 mil!!!! Much better.
As I stated back then, the thin one had a problem. It did not lay flat and thus wobbled when spun---thus making the cut larger than it needed to be.
My guess is that the packaging was part of the problem.
The way the cardboard holds the disc causes some flexing.
I did the best I could with as steady a hand as possible.
Not bad, but I wish it could have been better.
Solder filled in the gap when I installed the railing.
Well, recently, I was at Harbor Freight and picked up a package of these.
20.5 mil steal disc coated with diamond dust. About the same size as the middle disc above, but that one is ceramic and breaks easily.
So these were bought for general modelling use.
Package came with 2 mandrills and 4 discs. So...... I had two extra discs laying around.
And then the heavens parted, and a moment of brilliant inspiration hit me.
I wonder if I could place these extra rigid discs above and below the skinny disc and add extra support so it does not wobble so much.
And it worked. In fact, the new discs were of a smaller diameter than my thin disc-- which was perfect.
I now had a thin cutting edge.
The difference in actual use was astounding.
Look at this first attempt with the new configuration (and compare with the old way above).
The actual disc is 5.5 mil.
The cut on the right is 10 mil.
The one on the left is a little more.
This is VASTLY better than my previous attempt.
On the previous thread, I just showed a photo with no further research on the product.
A widow who was married to a dentist gave me these.
The results are now so much better, I found more info if any of you are interested.
I did a internet search of simply "x927-7". The first hits were from these discs-- which are still sold for dentistry.
Here are three sources I found right off the bat (these links may not last a long time (like the Amazon link):http://www.amazon.com/Premier-Diamond-Disc-X927-7-Mandrel/dp/B001EMIJ42http://www.net32.com/ec/thin-flex-x927-7-0-15mm-45-d-88635http://www.newarkdentalpemco.com/premier-diamond-disc/11425-ts-disc-x927-7-ds-2-pk.html
As you can see, they are pricey at 50 bucks for 2 discs.
That is a lot of money..... but the results for cutting brass were amazing.