# Maz bit size for slab surfacing?

**URL:** <https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437>\
**Category:** Gen 2 Elite Series\
**Created:** [July 31, 2026, 2:42pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437 "2026-07-31T14:42:47Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![danscrima](https://avatars.discourse-cdn.com/v4/letter/d/ee7513/32.png) [@danscrima](https://forum.onefinitycnc.com/u/danscrima)\
**Post date:** [July 31, 2026, 2:42pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437/1 "2026-07-31T14:42:47Z")

</div>

I have the Elite Gen 2 Foreman with the Redline 2.2 spindle… I just got it set up and have been learning the machine and started by surfacing some slabs. I found with my 2.5" flattening bit that I’m stalling the spindle even while babying some of the cut settings. The last attempt I only gave it a 40% step over with a depth of cut of .1" and it still stalled. Even with my speed at 30% of what the bit suggested in the default settings, it was stalling. I assume I’d be better off with a smaller flattening bit, just seeing what people have had success with?

---

<div class="post-metadata">

**Author:** ![Sinzard](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/sinzard/32/32876_2.png) [@Sinzard](https://forum.onefinitycnc.com/u/Sinzard)\
**Post date:** [July 31, 2026, 2:49pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437/2 "2026-07-31T14:49:49Z")

</div>

i would step down to a 1 inch slab flattening bit vs a bit that size…

---

<div class="post-metadata">

**Author:** ![Robowood](https://avatars.discourse-cdn.com/v4/letter/r/d78d45/32.png) [@Robowood](https://forum.onefinitycnc.com/u/Robowood)\
**Post date:** [July 31, 2026, 2:50pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437/3 "2026-07-31T14:50:51Z")

</div>

I am not experienced with the OF Gen 2, but my experience tells me a 2.5" bit at 0.1 is too much. Lessen the depth of cut. OF seems to be a great machine but not capable of beefy 2.5" cutter going .1. I have much more powerful spindle on a ShopSabre at the school I work at, and I would not be running it anymore aggressive than what you are running your OF. For flattening a SB .1 is a lot. Shave it down thinly.

---

<div class="post-metadata">

**Author:** ![LFwood](https://avatars.discourse-cdn.com/v4/letter/l/f08c70/32.png) [@LFwood](https://forum.onefinitycnc.com/u/LFwood)\
**Post date:** [July 31, 2026, 9:58pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437/4 "2026-07-31T21:58:01Z")

</div>

your DOC is too far try .06 or .05 on your program. 40% is fine, ideally a 14-16k rpm and feed of 100-150

---

<div class="post-metadata">

**Author:** ![Sinzard](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/sinzard/32/32876_2.png) [@Sinzard](https://forum.onefinitycnc.com/u/Sinzard)\
**Post date:** [July 31, 2026, 10:11pm UTC](https://forum.onefinitycnc.com/t/maz-bit-size-for-slab-surfacing/39437/5 "2026-07-31T22:11:42Z")

</div>

Here is what i use. I use the 1/2 inch shank version. Works like a champ.

> **[Spoilboard Router Bits | 1 Inch Dia | 3FL | Carbide Insert](https://woodpeck.com/products/ultra-shear-1-diameter-carbide-insert-spoilboard-router-bits?variant=43777099857979)**
>
> Ultra-Shear flattening router bits for slab flattening, spoilboard surfacing, planing. 1/4", 1/2", & 8mm shanks. 3 Flute. Replaceable carbide inserts. USA Made.