Comments sought on new build: A CNC Router for RC Gliders and Planes

**GeorgeD** · 23-08-2010

Hmm! can't quite make out whether these will cause friction,the washers at the outside of the bearing will rub against the rubber housing and cause some degree of friction.

Personally the washers shouldbe the size of the middle outer bore with at least a 2mm gap between support and bearing.

**GeorgeD** · 23-08-2010

Like this.....

Click image for larger version.

Name: IMG_0141 copy.jpg
Views: 1164
Size: 1.18 MB
ID: 2833

**njhussey** · 23-08-2010

Click image for larger version.

Name: photo.jpg
Views: 735
Size: 82.8 KB
ID: 2834

The washers do not rub on the rubber shield, see attached pic. But I was going to turn down some custom ones on the lathe if they did instead of using std M8 BZP washers. The bearing is a 608RS which is 22*7, the washers are 1.5mm wide and the centre of the axle is 10mm.

**Lee Roberts** · 23-08-2010

Hi mate, I think ideally you should look at re doing the axle stud, only this time start with larger stock and turn it down leaving a nice set of shoulders for the bearing inner race’s to home to. (Sleeves with shoulders)

The rubber shields on the bearings will turn but its not ideal and they could end up jamming.

**GeorgeD** · 23-08-2010

I'm also guessing that those bearings are 8 to 9mm wide? if so that spigots bearing spindle is far too wide and will cause the bearing to side travel.

**njhussey** · 28-10-2011

Been playing with Sketchup to see what my router will look like. Think I'm going to have to beef up my long (X axis?) rails as the gantry is going to be heavy...thinking about it might have to lighten it a bit else the stepper will struggle. The base is 1000mm x 500mm, box is 40x40x3 steel, plate is either 3mm or 6mm steel (all used as available from my works scrap bin!)

Comments???

**njhussey** · 01-11-2011

Been playing a bit more with Sketchup and added the spindle (see seperate thread for details on the spindle as designed by blackburn mark http://www.mycncuk.com/forums/showth...shless-spindle) steppers, leadscrews etc...

The more I look at it the more I am going to have to re-design the gantry as at the moment it will be too heavy. Will have to apply the KISS principle I think...

Below is a quick walk round video exported from Sketchup.

**njhussey** · 10-11-2011

Been chopping up some Delrin for lead screw nuts tonight, couldn't find my chop saw plastic blade so used my mitre saw instead :naughty:

Will finish off the round nuts in the lathe tomorrow lunchtime and finish tap them and also drill the white delrin and tap that as not sure which ones I'll use yet.

Hopefully my boring bar also comes in the post tomorrow as I can't wait to carry on with my DIY spindle

Still playing with my design...:whistling:

**blackburn mark** · 10-11-2011

i always use my mitre saw on delrin that i cant get to with a slit saw, a bit of elbow grease LOL.... id almost forgot what that is

**njhussey** · 16-05-2012

Well after doing nothing on this for months I'm going to cheat and use MDF to make the gantry sides (yes I know I know!!!) to get the project back under way as I'm spending all my money on RC helis. Then once it's working I'll use the machine to make upgrade bits for itself. The second router is already in the design stage, going to be a supported rail, twin leadscrew design...