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Re: cant figure out how to install the sanding disc's
Step 01: Prep the Pad
Using the same technique of making my own sanding disks as shown in my Instructable "Renewing Sanding Disks", I modified one slightly by punching a 3/4" (19.05 mm) diameter arbor hole and cutting relief slits so the retainer nut would nest subsurface. Step 2: The Build
1. Barrel style full body clamp with easy on/ off mounting
2. No physical or mechanical modification to the tool is needed
3. Slotted work surface table, adjustable in/ out, is centered with disk
4. Bench hook (lip) on front edge of base promotes immovability using just a single clamp
5. Simple "T" style adjustable miter gauge aids in precision work
6. Disks can be changed while tool is mounted by simply loosening and sliding off slotted work table
7. Easily accessible on/ off switch
8. Simple construction allows fabrication from cutoffs and drops
9. Model-makers especially, will find this tool most useful Step 3: Parting Thoughts
For enhanced safety, a guard would be advisable, however I have yet to install one.
More details open the link Best Disc Sanders For Sanding In 2018
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The holes are to suction dust for a vacuum attachment or dust collection bag. The sander will have a very smooth pad almost shiny if it takes stick-on discs (PSA). If not it will be a velcro pad and in that case you need the velcro discs. This description sounds like you have a velcro pad. Sticky discs wont stick to a velcro pad.
depends how important it is to vacuum the dust, most generic brand sandpaper discs will have different hole placements for the sander and the vacuum cant suck the dust up. if you are getting swirl marks from the edge of the sander, is the disc too small? a generic brand that is slightly larger may work but try and keep the sander flat or the excess disk can cause a little trouble with the finish.
Most commercially made disc sanders have replacements pads whether they are hook and loop type or the rubber. If you go to the manufactures web sit and look up your sander, it will usually be listed somewhere. But you might have to call an authorized repair center to find the part number to order.
what is the condition of the felt pad on the driver?? The sander should not be that hard, usually you need to lift up or slightly bear down to get the machine to move left or right. Are there any exposed nails in the area you are sanding and check the grit for the sanding conditions
Thought about what my orbital sander is like, then went to a craft store and bought a large sheet/pad of velcro and cut it to fit the 6" rubber disc pad glued it to the pad and then bought hook and loop sanding discs. And you wondering why I didn't use my orbital sander?? Because I needed to get into tight spaces and the orbital sander is a bit too large for this, plus it's too heavy to use working overhead .
Thanks for your site and for asking if problem still exists. Appreciate it.
"Necessity is the mother of invention" Truer words were never spoken
You did not specify how the sanding discs are meant to be attached to your sander's backing pad. My experience with this type of problem is material from the sanding process builds up on the backing pad and does not allow the sanding discs to adhere properly.
If you have a velcro type system, clean the hooks on the sander's backing bad by soaking the pad's face in a plate of paint thinner for 20 to 30 minutes then use a wire brush to remove the rest of the paint physically.
For adhesive pads clean the sander's backing pad surface with denatured alcohol. Do not use isopropryl or rubbing alcohol as this may not be 100% alcohol and could contain a lubricant like glycerin. When the sander's backing pad is completely dry and clean it will hold adhesive backed pads fine.
Flaky paint is best scraped off before sanding, use a wide putty knife or a paint scaper to remove large flakes before sanding. This will minimize airborne dust and cleanup.
For best results with adhesives, always keep your surfaces clean!
Good luck and happy sanding! Michael Mittelsdorf