Router Bit Size

[phmade]

I'm trying to decide on the best router bit to use.  I need to rout a notch in 3/4" Double Sided Melamine (PB Core).  The notch is about 2"x3" so the bit will be fully surrounded by the material, I'm not just trimming the edge.  I've been looking at some of the spiral compression bits used on CNC's but I'm not sure what size would be best.  Would 1/4"DIA be too weak?  I would prefer to use the smallest big possible so that I'm generating less dust and wear on my router.  I'm using an OF1400 router.  Any input would be greatly appreciated.

Thanks!

 

[tjbnwi]

I would create a template, use a 1/4" or 1/2" pattern bit with 2 top bearings installed.

You must make sure the waste piece is captured. You don't want it coming loose and jamming the bit. Place the melamine on a work surface, use 2 sided mounting tape in the area where the waste is.

I route the electrical box openings in plywood garage liner as above.

Tom

 

[phmade]

Thanks Tom - I am making a template out of 1/2" solid surface material that I had left over. 
I think I would prefer to use a template guide as opposed to a bearing bit.  I'll be using this in a production environment so I think the bearing would wear out and the bearing bit would be more expensive than a non-bearing bit. 

Now I'm just searching for the right bit... I'm looking for an 8mm (shank and cutter diameter) solid carbide bit.  Would there be any downside to using an solid carbide endmill?  There seems to be a much better selection of endmills...

Another question - why do you recommend a bit with 2 top bearings?  I have a single top bearing bit and I've never liked it because I have to be so careful not to tip the router. 

 

[Roseland]

I'd get an MFS-400, 30mm guide bush and 1/4" upcut bit.

I bought the MFS a couple of years ago, thinking I might use it occasionally, but I find I actually use it on just about every project.

Andrew

 

[Neathawk Designs]

Is it something you can do in multiple passes?  If so... then I think you could use that size bit.  You'd have to make sure the first pass makes it past the upcut, so your cut is clean on the top side. 

 

[JeromeM]

. 
Now I'm just searching for the right bit... I'm looking for an 8mm (shank and cutter diameter) solid carbide bit.  Would there be any downside to using an solid carbide endmill?  There seems to be a much better selection of endmills...

There is no downside to using an solid carbide endmill if you compare it with the same size solid carbide router bit. The main difference is that the end mills are cheaper and have a wider selection of sizes and flutes.

 

[phmade]

Thanks for the replies - I ended up purchasing (2) different 8mm carbide end mills.  One is a 4-flute spiral, and the other is a 2-flute straight bit.  I figured this was a good compromise and I can use it in my 8mm collet.  I'll be testing it over the next couple days and I'll report back.

 

[JeromeM]

Thanks for the replies - I ended up purchasing (2) different 8mm carbide end mills.  One is a 4-flute spiral, and the other is a 2-flute straight bit.  I figured this was a good compromise and I can use it in my 8mm collet.  I'll be testing it over the next couple days and I'll report back.

you may well have to slow down the router for the 4-flute spiral to avoid burning.

 

[tjbnwi]

Thanks Tom - I am making a template out of 1/2" solid surface material that I had left over. 
I think I would prefer to use a template guide as opposed to a bearing bit.  I'll be using this in a production environment so I think the bearing would wear out and the bearing bit would be more expensive than a non-bearing bit. 

Now I'm just searching for the right bit... I'm looking for an 8mm (shank and cutter diameter) solid carbide bit.  Would there be any downside to using an solid carbide endmill?  There seems to be a much better selection of endmills...

Another question - why do you recommend a bit with 2 top bearings?  I have a single top bearing bit and I've never liked it because I have to be so careful not to tip the router. 

Stability and 2 bearings give you more surface against the template.

Template with bushing works well also, make sure you get the size correct.

8 mm carbide end mill or spiral router bit will work well. Again the most important thing is not to allow the slug to come free and jamb the bit.

Tom Belemere should be able to check Festools remaining bit inventory for an 8 mm but. The Festool router bits I own are some of the best bits I've ever owned/used.

Tom