# Compression Bit

**URL:** <https://forum.sienci.com/t/compression-bit/4205>\
**Category:** 🏃🏼 Tools & Speeds\
**Created:** [November 16, 2021, 10:37pm UTC](https://forum.sienci.com/t/compression-bit/4205 "2021-11-16T22:37:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![BC201](https://forum.sienci.com/letter_avatar_proxy/v4/letter/b/d6d6ee/32.png) [@BC201](https://forum.sienci.com/u/BC201)\
**Post date:** [November 16, 2021, 10:37pm UTC](https://forum.sienci.com/t/compression-bit/4205/1 "2021-11-16T22:37:57Z")

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Bought the 1/8" compression bits for the Sienci Store and they cut fantastic, especially through 1/4" plywood. Some of the cutouts I am working on require a 1/16" bit. I have 1/16" up and down cut, but get fuzzy cuts at top or bottom of piece depending on which I use. Does anyone know if 1/16 compression bits even exist? I have searched the internet with no luck. If anyone knows or has seen these bits please let me know.

Thanks in advance.

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [November 16, 2021, 11:49pm UTC](https://forum.sienci.com/t/compression-bit/4205/2 "2021-11-16T23:49:26Z")

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@BC201 Like you, Chuck, I’ve never seen one. I would think that the issue may be that the cutting length of 1/16" bits is so short that to get both and up cut and down cut spiral on them is not possible.

You’ve likely already considered this, but when I am cutting jigsaw puzzles, I set two tool paths, each 1/2 the thickness of the material. I cut the top half using the down cut bit and the bottom half using the up cut bit. That way, both surfaces are clean. For the second tool path, I start it where the first left off so I’m not cutting air. It adds to the time for each project, but I’m too lazy to do all that sanding.

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**Author:** ![TimB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/t/3e96dc/32.png) [@TimB](https://forum.sienci.com/u/TimB)\
**Post date:** [June 22, 2024, 5:40pm UTC](https://forum.sienci.com/t/compression-bit/4205/3 "2024-06-22T17:40:36Z")

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More questions re-the compressions bits since they are not on the [Speeds and Feeds PDF] ([https://resources.sienci.com/wp-content/uploads/2022/10/FeedsSpeedsMetric.pdf](https://resources.sienci.com/wp-content/uploads/2022/10/FeedsSpeedsMetric.pdf)).

What should the 1/8" Compression bit cutting parameters and Feeds & Speeds be set to? Are these correct if I was to cut plywood and/or MDF?  
Pass Depth .1496 in (3.8mm) with 40% stepover.  
Spindle speed 12000 (Makita #1 or 2)  
Feed Rate 80 in/min (2030 mm/min) or faster?  
Plunge Rate 100 in/min (2540 mm/min)?

Also is there is a better bit to cut t-nut and dog holes in 3/4 MDF for my spoil board?

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**Author:** ![CharlieMike](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/838e76/32.png) [@CharlieMike](https://forum.sienci.com/u/CharlieMike)\
**Post date:** [June 23, 2024, 2:52pm UTC](https://forum.sienci.com/t/compression-bit/4205/4 "2024-06-23T14:52:11Z")

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I am about to cut a lot of 1/2" plywood with the same bit. I am going to use the “regular speed” F&S they list for 1/8" UC and DC bits as my start. I figure compression will be similar. Only hiccup being pass #1 should be greater than 3mm deep so the first cut uses the DC portion of the bit (which you’re doing).