ddp73
off to a rocking start
Member since April 2012
Posts: 2
|
Post by ddp73 on Apr 2, 2013 18:36:33 GMT -5
Hello everyone, I need some advice. I'm using a Richardson's high speed sander to sand thundereggs. I start with either 60grit or 120grit depending on the saw marks, that step is fine. When I switch to 400 grit for the next step it leaves all these scratches in my t-eggs (its especially noticable on Richardson ranch t-eggs) that will not come out even if I try sanding with a 600grit paper. I have tried breaking in the sanding disc from new by using a junk t-egg, but I cannot get rid of the scratches. I'm using mercer abraisives sanding discs. Anyone have any idea on what I may be doing wrong. I can post photos of the scratches and the worn in sanding discs if it would help. Thanks for any help
|
|
|
Post by Rockoonz on Apr 2, 2013 21:26:51 GMT -5
Try this... Look at your saw marks when starting and rotate the egg to 90 degrees from them so you are sanding across the lines. The dust from sanding (you ARE wearing a mask right??) will fill the saw lines until they are sanded away. Next change to your next disc, turn it 90 degrees again and sand in that direction till all the scratches from the first are gone. Repeat with each step. Also don't go under the sanding disc far enough to contact the spanner nut that holds the sandpaper in place.
Lee
|
|
ddp73
off to a rocking start
Member since April 2012
Posts: 2
|
Post by ddp73 on Apr 2, 2013 22:29:53 GMT -5
Thank you Lee I will give that a try.
|
|
|
Post by johnjsgems on Apr 3, 2013 8:40:13 GMT -5
You may need steps between coarse and 400. Finer usually shows scratches made previously. Try adding a 220 step after 100. Sand until you don't see deep scratches. Then move on to 400. Any step where scratches show back up one step.
|
|
|
Post by roy on Apr 3, 2013 8:44:21 GMT -5
when i use mine its 36,80,120,220.400,600,pollish
|
|
herb
spending too much on rocks
Member since November 2011
Posts: 444
|
Post by herb on Apr 9, 2013 20:30:24 GMT -5
This is a timely post! I was just starting to experiment with sanding thundereggs with my Richardson sander. I started with some eggs that appeared to be semi-polished at 400 grit but am not having much luck. I think I need to start at a courser grit first.
I did discover how fast you can destroy a sheet of sandpaper when you let the edge of a thunder egg catch the paper! Thank God for safety glasses!
The question I had, is does anyone know where I can buy the buffing disk that the paper attaches to? It is 7 inch in diameter and (I think) the motor shaft is 1/2 inch. It would be nice to be able to just switch out the discs rather than having to go thru a whole bunch of t-eggs at one grit before removing the paper at gluing down the next grit.
|
|
|
Post by johnjsgems on Apr 10, 2013 8:34:47 GMT -5
Someone told me it was 5/8"-11. If so the 7" BD/MK Velcro holder would work. Then you could use their Velcro backed SC discs as long as speed isn't too fast. Dry sanding may melt the Velcro cement off from the heat though.
|
|
|
Post by roy on Apr 10, 2013 9:09:54 GMT -5
richardsons sells all the parts and paper for the sander
|
|
herb
spending too much on rocks
Member since November 2011
Posts: 444
|
Post by herb on Apr 11, 2013 9:10:07 GMT -5
Someone told me it was 5/8"-11. If so the 7" BD/MK Velcro holder would work. Then you could use their Velcro backed SC discs as long as speed isn't too fast. Dry sanding may melt the Velcro cement off from the heat though. You are right, I just measured the motor shaft. It is 5/8 but it is not threaded. There is a channel in the shaft to accept a set screw that is on the female coupling that is attached to the rubber pad.
|
|
|
Post by Rockoonz on Apr 13, 2013 0:50:09 GMT -5
The sanders I'm familiar with don't require discs to be glued on. The discs have holes on the center and the rubber backing pad has a spanner nut in the middle to hold them on. Takes less than a minute to change grits.
Lee
|
|
herb
spending too much on rocks
Member since November 2011
Posts: 444
|
Post by herb on Apr 13, 2013 10:44:11 GMT -5
The sanders I'm familiar with don't require discs to be glued on. The discs have holes on the center and the rubber backing pad has a spanner nut in the middle to hold them on. Takes less than a minute to change grits. Lee Mine does have the spanner nut, but I assumed that if I just held the paper that way, it would flop about a bit (even with the centrifugal force) and get torn up more easily. I know the last disc I worked with, the light coat of glue I used released a bit and it started making a fair amount of noise slapping against the rubber pad. I just assumed that would significantly shorten the life of the paper. I guess I will try a disc sans glue and see what happens.
|
|