# Center Hole Placement

**URL:** <https://forums.maslowcnc.com/t/center-hole-placement/5486>\
**Category:** Sled\
**Created:** [August 6, 2018, 12:57am UTC](https://forums.maslowcnc.com/t/center-hole-placement/5486 "2018-08-06T00:57:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jwolter](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/jwolter/32/30787_2.png) [@jwolter](https://forums.maslowcnc.com/u/jwolter)\
**Post date:** [August 6, 2018, 12:57am UTC](https://forums.maslowcnc.com/t/center-hole-placement/5486/1 "2018-08-06T00:57:25Z")

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I’m starting to think about our final sled and I suddenly realized that I was assuming something that I couldn’t prove. Is the center of a round sled the best place for the router? Of course the router should be on the vertical centerline, and if it is too close to the top or bottom, then there won’t be enough support below or above it, respectively. I could believe, however, that there could be some advantage to having the router centered on a spot, say, an inch above or below the center of the sled. Has anyone looked into this?

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**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [August 6, 2018, 1:07am UTC](https://forums.maslowcnc.com/t/center-hole-placement/5486/2 "2018-08-06T01:07:39Z")

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> [@jwolter](#):
>
> the router centered on a spot, say, an inch above or below the center of the sled

I built one with the router 1.5" above the horizontal center, it gave more room for locating the weights I wanted to use - it worked fine.

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**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\
**Post date:** [August 6, 2018, 1:13am UTC](https://forums.maslowcnc.com/t/center-hole-placement/5486/3 "2018-08-06T01:13:34Z")

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the router needs to be centered on the chain mechanism.

beyond that, you need the sled to not fall into the holes that you cut, this is  
much easier to understand if the sled extends the same distance in all  
directions.

But people have posted triangular and octagonal sleds, they work. The original  
sled was more X shaped. There’s nothing magic about the sled shape, you are  
trying for minimum friction, and minimum chance of catching on an edge you have  
cut or falling into a hole you have cut.

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**Author:** ![jwolter](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/jwolter/32/30787_2.png) [@jwolter](https://forums.maslowcnc.com/u/jwolter)\
**Post date:** [August 6, 2018, 1:35am UTC](https://forums.maslowcnc.com/t/center-hole-placement/5486/4 "2018-08-06T01:35:58Z")

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Food for thought. Thanks!