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I could never find the perfect Blue Belt/Elsectric Furnace ratio, so I tested it.
It requires 61 Electric/Steal Furnaces (or 122 Stone Furnaces), to completly smelt all the ore on a completly saturated blue belt.

thanks

so 30 on each side? or a length of 61 with furnaces on both sides? but taht would make a lot of furnaces

it's actually more, you need about 72 of steel/electric furnaces
https://www.reddit.com/r/factorio/comme ... ce_ratios/
maybe you had the furnace buffer full

Gleaning the wiki, it's learned that a blue belt can transport 40 items per second (throughput, T).
Knowing that it takes 1.75 seconds for an electrical or steel furnace to process a piece of ore, we get 1/1.75 ore per second per furnace (production, P).
To process 40 ore per second, you would need 70 (= T/P) furnaces.

Going by dimensional analysis, this approach should be correct.

TN_Creator wrote:thanks

so 30 on each side? or a length of 61 with furnaces on both sides? but taht would make a lot of furnaces

It does not matter how the furnaces are arranged.

Tias wrote:I could never find the perfect Blue Belt/Elsectric Furnace ratio, so I tested it.
It requires 61 Electric/Steal Furnaces (or 122 Stone Furnaces), to completly smelt all the ore on a completly saturated blue belt.

If you are only getting 61 you probably have a bottle neck somewhere in your system or are not compressing the blue belt.

I usually build 72, but technically 71 should be mathematically enough/correct.

I found that when I put the iron plates directly from the furnaces to the blue belt, the inserters would space them out a bit too much and the result would be the final furnaces near the iron output end are unable to unload properly. 36-48 is the max if you're using blue/green inserters directly onto the blue belt. Otherwise you're going to have to find a way to compress the iron as it comes onto the blue belt.

Swadius wrote:Otherwise you're going to have to find a way to compress the iron as it comes onto the blue belt.

this is only way I know of (36 furnaces on each side should compress it, if you can keep the ore coming) I'm not sure what the numbers are if you put PM3s on the furnaces and SM3s in bacons in rows beside the furnaces - presumably less than 36 on each side, but I don't know how much less.

Is there a reason the inserters are not directly putting them into the splitters?

Probably not, I just don't personally like pointing inserters at/against turns, splitters, or undergrounds entrances/exits; but I think that's just an aesthetic preference. (I could be wrong, though - there might be a real difference)