# Can you use a bit extender with a 2.2kw spindle

**URL:** <https://forum.onefinitycnc.com/t/can-you-use-a-bit-extender-with-a-2-2kw-spindle/19077>\
**Category:** Spindle/VFD (Aftermarket/Unsupported)\
**Created:** [February 27, 2023, 2:19am UTC](https://forum.onefinitycnc.com/t/can-you-use-a-bit-extender-with-a-2-2kw-spindle/19077 "2023-02-27T02:19:29Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [February 28, 2023, 6:27pm UTC](https://forum.onefinitycnc.com/t/can-you-use-a-bit-extender-with-a-2-2kw-spindle/19077/4 "2023-02-28T18:27:26Z")

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Hey Mike,

the traditional Z-16 Z assembly (on [Machinist](https://www.onefinitycnc.com/product-page/onefinity-machinist-original), [Woodworker X-35](https://www.onefinitycnc.com/product-page/build-your-own-onefinity), [Woodworker X-50](https://www.onefinitycnc.com/product-page/onefinity-woodworker-1), and [Journeyman](https://www.onefinitycnc.com/product-page/onefinity-journeyman)) always allowed it to **drill holes into your machine bed** , since it can be attached in three different height positions to the X carriage, as shown here:

 ![Z-Slider_Mounting_holes_1-3](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/a/8/a86e0720b93f37a218f0d0568f151abb9a7c9506.png)

The [new Z-20 Z assembly](https://forum.onefinitycnc.com/t/introducing-the-z-20-heavy-duty-z-slider/16622/1) now, which is higher and has now 165 mm Z travel (compared to 133 mm on the Z-16) [was introduced for the Elite Foreman machine](https://forum.onefinitycnc.com/t/spindle-travel-limitations/17379/8) because this machine [sits not on Y-35 rails, but on Y-50 rails](https://forum.onefinitycnc.com/t/introducing-the-elite-foreman-a-48x48-cutting-machine/16764) wich are higher, and the Z-16 would not reach down far enough. The new Z-20 Z assembly **has now four different height positions** in which you can attach it to the X carriage. I would assume that in the lowest position you can reach lower than the machine feet, just like you can with the previous machines with Y-35 rails and Z-16 Z assemblies.

Since neither I, nor anybody else yet owns a [Foreman machine](https://www.onefinitycnc.com/product-page/elite-foreman-48-x48-cut-area), it’s up to @onefinitycnc to give the dimensions. There is already a thread [going on here](https://forum.onefinitycnc.com/t/spindle-travel-limitations/17379) that tries to guess the Z-20 dimensions.

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