I had to cut some precise circles in thick mdf for fitting my new router motor to the old style Jessem Rout-r-Lift on my router table. That's a long story, but I thought that people might just be interested in the cutter jig I made for the OF 1010 router.
I have the trammel bar for the OF 1010, but the problem I had here was that the smallest radius circle that will allow is about 85mm and I needed to cut various circles down to a radius of 32mm. I started looking around for various ways of cutting a larger circle and then using offset guide bushes to achieve the required size. Of course, this was going to be a faff and not very precise. The answer was simple when I googled for help. I found it here in the form of Ron Fox's routing tips http://www.wealdentool.eu/rf_tips/rf_tips_04.html so I do not claim any merit for the design. [Ron Fox was a very genial and practical chap with the router and this is a good example of his practical tips that live on].
I had some 3mm and 6mm acrylic sheet, so I superglued that together to make a 9mm block. The OF 1010 does not have any separate threaded fixing points on the base, so I used 4 of the screws that secure the phenolic base - I found some 4mm flanged bolts that I cut down to fit. The pin I made from the plain shank of a screw - this is 4mm and matches the pin on the trammel bar, so that where necessary I can use the same centre hole for big and small concentric circles (it also allows precise measurement of the radius by deducting 2mm).
I cleaned up the edges and routed the slots using my Woodrat (the perfect tool for a one-off job like this btw). The pin was a friction fit into a 4mm hole countersunk on the top side with a dab of superglue for good measure. I made the centre slot wide enough to allow the collet nut to plunge through.
Here is the OF 101 with the trammel bar:
Here is the finished item:
And fitted to the OF 1010:
It is a dream to use and very successfully routed my small circles.
Hope that may be of interest.
I have the trammel bar for the OF 1010, but the problem I had here was that the smallest radius circle that will allow is about 85mm and I needed to cut various circles down to a radius of 32mm. I started looking around for various ways of cutting a larger circle and then using offset guide bushes to achieve the required size. Of course, this was going to be a faff and not very precise. The answer was simple when I googled for help. I found it here in the form of Ron Fox's routing tips http://www.wealdentool.eu/rf_tips/rf_tips_04.html so I do not claim any merit for the design. [Ron Fox was a very genial and practical chap with the router and this is a good example of his practical tips that live on].
I had some 3mm and 6mm acrylic sheet, so I superglued that together to make a 9mm block. The OF 1010 does not have any separate threaded fixing points on the base, so I used 4 of the screws that secure the phenolic base - I found some 4mm flanged bolts that I cut down to fit. The pin I made from the plain shank of a screw - this is 4mm and matches the pin on the trammel bar, so that where necessary I can use the same centre hole for big and small concentric circles (it also allows precise measurement of the radius by deducting 2mm).
I cleaned up the edges and routed the slots using my Woodrat (the perfect tool for a one-off job like this btw). The pin was a friction fit into a 4mm hole countersunk on the top side with a dab of superglue for good measure. I made the centre slot wide enough to allow the collet nut to plunge through.
Here is the OF 101 with the trammel bar:
Here is the finished item:
And fitted to the OF 1010:
It is a dream to use and very successfully routed my small circles.
Hope that may be of interest.
