tpyke

Is there any disadvantages to the 3 1/8" center?
...Or advantages to the 1 1/2"?
I figure if you can fit all bits in the 3 1/8", whats the point of the 1.5"??

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AxlMyk

You want the opening as small as possible for safety and control of the operation. If you were to use a 1/2" bit in a 3 1/8" opening, you could wind up with your stock trying to go down the hole. Not a good situation. If you were using a panel raising bit, you want to have the large opening to clear the size of the bit. That's why plates have inserts to adjust the size of the opening.

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Mainewood

TPYKE,
For starters, you want to have as much flat surface around your cutter as possible. This helps reduce the chance of your project piece, depending on its size, from dipping into the open space around your cutter and messing up your work and possibly your fingers. Keeping the size of the hole as close to the cutter diameter as possible helps keep dust out of your router motor as well--just a couple of suggestions.

Happy Thanksgiving,
Mainewood (Ray)

bobj3

Hi tpyke

It's more or less a safety issue ,it's true you can use just about any bit if the hole is 3 1/8" but do you realy want to...

Most of the time you would only see 66% of the hole at one time but that black hole can be dangerous if the part you are routing falls into that hole and jams the bit it can happen so quick...and you will not need to install a TP holder on your router cabinet...as a back up device...

The hole should only be just a bit bigger than the bit you are using,most don't use the brass inserts the norm they just use the 1 1/2" hole that's in the base plate and that's fine most of the time but the brass insert should be in place when you are using less say a 1/4" bit....again it's a safety issue and it's not worth the risk ,it's only some wood your working with...if it's worth doing it must be worth doing it safe..

http://www.leevalley.com/wood/page.a...000,51208&ap=1
http://www.leevalley.com/wood/page.a...000,51208&ap=1
http://www.harborfreight.com/cpi/cta...emnumber=95160

Multi-Sided Glue Joint Router Bits
http://www.mlcswoodworking.com/shops...ed_glue_anchor
http://woodworkersworld.net/router_b...ter_bits.shtml
http://www.sommerfeldtools.com/list.asp?d=47&p=1
http://cgi.ebay.com/1-PC-1-2-Shank-8...QQcmdZViewItem

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tpyke

I'm surprised that no one sells a 3 1/8 insert with a 1 1/2" hole like Bob made....or do they?

Are the Oak park base plates counter bored to accept the brass inserts? If so, is it 3/16 or 3/4?

RustyW

tpyke, here is one of the cheapest out of many that are available. The smallest hole is recessed to accept Porter Cable style guides.

http://www.harborfreight.com/cpi/cta...emnumber=94331

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bobj3

Hi tpyke

The 3 1/8" hole size is a odd ball size, no one makes a insert that size that I know about and the 3 1/8" is a tapered hole that's why you see the 3 1/4" OD insert ring I made...just took it to the drum sander to get it to 3 1/4" size with true square sides..

I also like the PC type brass guides that Rusty W. talked about but I also like the 1 1/2' brass guides and I have a insert ring to take them on,,,they make it nice when you want to use a 1 1/2" bit with the insert in place unlike the PC type (1 3/16") brass guides that max out at 1" ID...



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Attached Thumbnails

   

__________________
PodCast videos
RWS on YouTube

http://www.routerforums.com/86898-post1.html
Besure and click on the Up Arrow key ▲ on the Youtube video, you can select other youtube videos on router tables
http://www.woodworkingonline.com/?s=dovetail
Machine Cut ▼
http://www.woodworkingonline.com/200...cut-dovetails/

http://www.woodworkingonline.com/woo...podcast-store/

http://www.woodshopdemos.com/menu2.htm

Bob J.