Re: DIY Wood Router Design
3/4" sides will always flex.
If you want to make them stiffer, you could laminate 3 pieces of 1/4" MDF together, or two pieces of 1/2".
Re: DIY Wood Router Design
Hi Turner - 2x3/4" = 1.5" thick columns would be the go. Can be tailored around the top with pockets but the bearing area and middle definitely need to be thick. Plywood is twice as stiff (or more) as MDF but twice the cost. Maybe better to use ply? eg formply is stiff and you don't have to paint it at the end? Only seal the edges...Peter
Re: DIY Wood Router Design
Any reason why you couldn't trim the MDF flush with the back face of the extrusion on the gantry,allow the extrusion to extend as far as the stepper protrudes and then bolt an MDF web to the back face?It could be fixed to the side plate of the gantry by a piece of angle or a wooden batten and glue.
Re: DIY Wood Router Design
Hi Turner and use aluminium angles for the extrusions? Need more support at the extrusion to timber connection. Probably don't need 4 cars and two rails each side as well. The square cars are quite stiff. You need heavy preload cars if possible. Std preload is not enough.... More bracing between the top and bottom gantry beam or try to use one large beam....
I always wonder how to get the rails parallel when they are mounted on the sides? Do you commit one side so its a master then wiggle the other side, then screw it together? Peter
Re: DIY Wood Router Design
Hi all, thank you for your input - it's appreciated!
- I ended up buying 3/4 birch plywood. For the vertical, I think I'll keep it 3/4 thick but add webbing or angle to the side to stiffen it up. Routalot, your idea is pretty good, I'll see how that might work out.
- I will also add more bracing on the Y axis gantry beam.
- I already bought the rails for the X axis so I have enough rails to keep 4 cars and 2 rails on each side. Is that a waste? I was just worried 1 wouldn't be enough for each side.
Re: DIY Wood Router Design
Quote:
- I already bought the rails for the X axis so I have enough rails to keep 4 cars and 2 rails on each side. Is that a waste? I was just worried 1 wouldn't be enough for each side.
If they aren't aligned perfectly, they can bind.
Re: DIY Wood Router Design
2 rails on each side is a waste.
The load rating on these things is much more than your machine will generate or tolerate without falling apart.
Re: DIY Wood Router Design
Isn't it curious how many builders seek great rigidity along the machine and then neglect to consider that the end plates will be subject to similar loads when cutting across the table?It would be a strange design that had significantly weaker steppers on one axis and would make cutting circles an interesting experience.So often we see gantry end plates that are 3/8" aluminium and dual slender extrusions joining them and then we get to the topic that always makes me smile-a very long Z axis travel.This project doesn't have that as a desired feature but so many people fail to take into account the leverage imposed by a high gantry or the limited access into a corner with the Z operating close to the table.I just wish more prospective builders would read peteeng's thread about his new design and the level of engineering behind it.