# Bit Noise, Amana XL bits and general advice needed

**URL:** <https://forum.onefinitycnc.com/t/bit-noise-amana-xl-bits-and-general-advice-needed/27291>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [May 30, 2024, 11:01pm UTC](https://forum.onefinitycnc.com/t/bit-noise-amana-xl-bits-and-general-advice-needed/27291 "2024-05-30T23:01:10Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [May 31, 2024, 5:55am UTC](https://forum.onefinitycnc.com/t/bit-noise-amana-xl-bits-and-general-advice-needed/27291/6 "2024-05-31T05:55:54Z")

</div>

Hey JP\_36,

the longer your bit is, the more it will be bent and induce chatter. You will have the least problems if you always use the shortest bit possible. So if you want to mill a deep pocket, I would start with a short bit and use the long bit only when you reach more depth. Also the diameter of the bit is important. Unnecessary to say that a 6.35 mm bit is a little thin for the crazy length. The longer the bit, the larger the diameter should be to prevent bending and chatter. I would use nothing under 8 mm (Makita is sold with 6 and 8 mm collets outside of North America).

> [@Other router options other than Makita](https://forum.onefinitycnc.com/t/other-router-options-other-than-makita/25151/12):
>
> there are different sizes of the proprietay **Makita collets** available here:
> 
> [https://elairecorp.com/makitaroutercollets/](https://elairecorp.com/makitaroutercollets/)
> 
> By the way, outside of USA, the standard [Makita RT0702C](https://www.makitauk.com/product/rt0702c.html#tab_content_10) comes with 6 mm and 8 mm collets. You can [order them everywhere](https://forum.onefinitycnc.com/t/metric-collets-for-makita/18428/6).

Also when milling wood, I would use a very high rotational speed (depending on number of flutes, I use a [formula](http://www.sorotec.de/webshop/Datenblaetter/fraeser/schnittwerte_en.pdf)). And finally the depth of cut, the feed rate, and the stepover should correspond to what the hardness of the wood allows.

> [@Common bits to use when starting out](https://forum.onefinitycnc.com/t/common-bits-to-use-when-starting-out/24245/6):
>
> > [@White Oak or hardwoods in general](https://forum.onefinitycnc.com/t/white-oak-or-hardwoods-in-general/18725/7):
> >
> > #### Ball nose cutter
> > 
> > [![Radius Mill Z2 Ø 8 mm UNI](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/6/b/6b53322cf170f62613372962e027483429cbca66.jpeg "Radius Mill Z2 Ø 8 mm UNI")](https://www.sorotec.de/shop/images/product_images/original_images/1271_1.jpeg)  
> > [Radius Mill Z2 Ø 8 mm UNI](https://www.sorotec.de/shop/Radius-Mill-Z2--8-0mm-SL-20-UNI.html)
> > 
> > Here this 8 mm diameter ball nose is available in XL = 101 mm (4"), overall length, but with 6 mm diameter it is only available with 76 mm (3") overall length, which makes sense to me (¼" = 6.35 mm, 8 mm = ≈5/16").
> > 
> > [Sorotec Shop](https://www.sorotec.de/shop/) » [Cutting Tools](https://www.sorotec.de/shop/Cutting-Tools/) » [Sorotec tools](https://www.sorotec.de/shop/Cutting-Tools/sorotec-tools/) » [Radius Mill](https://www.sorotec.de/shop/Cutting-Tools/sorotec-tools/RADIUS-MILLS/) » [2-Flute UNI](https://www.sorotec.de/shop/Cutting-Tools/sorotec-tools/RADIUS-MILLS/Radius-Mills-UNI/) » Radius Mill Z2 Ø 8 mm UNI

With a spindle with ER-20 collet, you could use up to 13 mm bit shanks (including half-inch bit shanks) and very long bits that will bend less.

---

_[View the full topic](https://forum.onefinitycnc.com/t/bit-noise-amana-xl-bits-and-general-advice-needed/27291)._