Best way to make lots of 1/8" slots

[Richard Coers]

You can make a .125 standard blade cut wider by placing a piece or two of masking tape on the saw arbor back washer on one side. It makes the blade a wobble dado blade. Next option is a couple or 7 1/2" blades for a skill saw and see if you can use that for the slot. Some of those blades are really thin.

[Warren Lake]

if you can use stuff that wont compress that is why i said shim stock but have used whatever I find in the shop Lam backer or feeler gauge or. Feeler gauges easier to dial in. This is sort like those bobble dadoe blades, had zero interst in them when regular dadoes do the job.

[Bill Dufour]

HSS blade and a saw set. HSS teeth should last a good time in soft pine.
BilL D.

[Keegan Shields]

A router with edge guide and a 1/8" bit might be your most economical solution if you already own the router/edge guide. Or if you own a router table. Won't be as fast as a table saw but a router bit would be cheaper.

Cheap / Fast / High Quality - pick two...

[Edward Weber]

An 1/8" router bit cutting a 1/4" groove, will clog, vibrate, break, dull and probably do some other unwanted things, all in the first cut.
Freud makes an 8" combo blade that will work for what the OP described, for about $75
https://www.freudtools.com/products/LU84M008

This doesn't need to be complicated

[Keegan Shields]

An 1/8" router bit cutting a 1/4" groove, will clog, vibrate, break, dull and probably do some other unwanted things, all in the first cut.
Freud makes an 8" combo blade that will work for what the OP described, for about $75
https://www.freudtools.com/products/LU84M008

This doesn't need to be complicated

Sure buddy...

[Edward Weber]

Sure buddy...

Not sure what that means

[Dan Barber]

I belive it means he does not agree with your assessment that 1/8" router bit won't work. I tend to agree with him, router could work just fine if the right technique is used.

[Bill Dufour]

I guess no one here owns an adjustable sawset? This is almost the job they are designed to do, isn't it?
Bill D

[Edward Weber]

I belive it means he does not agree with your assessment that 1/8" router bit won't work. I tend to agree with him, router could work just fine if the right technique is used.

IME
An 1/8" bit will work BUT it will encounter more issues than a saw blade, as I mentioned
1/8" router bits have extremely small flutes and when used in a wood like pine, they usually tend to gum up with resin quite quickly, necessitating frequently cleaning. They also have the tendency of overheating when used for large amounts of stock removal (lots of slots)

These are just a few reasons why I would use a saw instead of a router.
YMMV, Feel free to disagree