Mike

Outside of easier math, it strikes me the 1-1/2" (37.5 MM?) should be capable of most of the jobs using template guides that the 40 MM guide will do. Granted not all bits will fit but there is ample clearance for the collet and swarf removal. Since the 40 MM guide is not available isn't this a viable alternative for North American members?

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Mike

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template tom

Bob
All the routers I have the collet nuts are much larger than 22mm and they will not fit through a 30mm guide which would have an internal diameter of say 27mm . Hence the reason for the 40mm. This is Makita and Hitachi 1/2" Routers which are excellent routers for use in the plunge mode. Note the latest Hitachi comes with a smaller Collet (Chuck)

The largest cutter I have used with the aid of the template Guides is 33mm (Dish Cutter) and yes it was used at variable speed (slower). Bob yes it is safe when using the template guide and using Female Templates, there is no bearing required.
I think I see your concern (or maybe I am wrong) I am not using a Male Template to produce something larger than the template I am using a Female template which will control the path of the cutter. I hope this explaination is ok Feel free to ask further and maybe I can submit a drawing to illustrate what I mean.
Tom

template tom

Mike
Yes you are correct of course all that is required is to make the necessary calculations for the various guides. I began my experimentation with the 40mm 30mm 16mm because they were the guides supplied by Makita and Hitachi. (They also produce other sizes of course which I have purchased to complete a process not available with the 'standard' Guides). I have also had manufactured 39mm 41mm 50mm 60mm 70mm 80mm 90mm 100mm The latter were modifications to a 30mm guide or I had a special holder made to take the larger Guides. I know I have opened up a 'can of worms' so to say by mentioning the larger guides. I did have a couple of projects that required the larger guides when I had my Cabinet-making Business
Tom

Mike

Tom, in thinking over the goals of using the larger guide bushings wouldn't pattern following bits with bearings accomplish the same results? By way of example Whiteside makes bearings in 11? different OD's which fit a multitude of their bits, and that is just the 3/16" ID bearings. These are tip mounted and perfect for table use but they also manufacture larger ID bearings which can be mounted on the shank. Is there a safety consideration using bearings as opposed to guide bushings? I can't see any. Am I missing something?

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Mike

template tom

Mike
The cutters I use with the template guides do not have bearings added and they are not all straight cutters. I would say that there was safety involved in the use of the template guides as I've said before consider a blind person using the method
Tom

Mike

Ok, the guide bushings will allow you to set the router in place before plunging the bit. I can see the safety difference between this and using a bearing guided bit. With a bearing you do not have proper alignment until the bit is fully plunged into the work. There is also the depth of cut to consider, it is not variable using a bearing. The bit would need to be fully extended for the bearing to contact the template. This makes sense to me. Thanks for helping me sort this out.

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Mike

template tom

Mike
As a matter of interest I do not usually work with top bearing cutters In fact no bearings at all. I have two top bearing cutters 10mm and 19mm and for the reasons you have stated I do not even talk about them when I give demonstrations at woodshows.
I have enclosed samples of the cutters I use with the guides
Tom

Attached Thumbnails

         

     

Dewy

Quick lesson in metric conversion.
1½" = 38.1mm not 37.5

¼" = 6.35mm
1" = 25.4mm
½" = 12.7mm
¾" = 19.05mm

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Dewy
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Mike

Dewy, I dont normally work with metric sizes and took a guess which was close enough to make my point. The bushing IS large enough for Tom's method.

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Mike

Hamlin

I for one have always been confused by the metric system, (always will be), but, I'm like Mike, I don't work with it very much.

Tom, could you by chance post a pic of the 40mm? I have a Makita3612C, purchased through amazon, and I don't have any guides except that from Oak Park.
Also, I think you answered this one other time not sure, do you use any type of bit extension(s) with your guides?

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Ken

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