Hi Michel.

”Most of the time, risers are not machined but worked manually while assembling the stairs to cut them to length and work the angles with a band sander. ”

Aah alright thats one way that we haven’t heard befor. I do think that its not a super way to work, when your assembeling and mounting the staircase at the costumers house. If your going to produce a staircase with a cnc, you should make everything with the cnc to make assembeling time shorter and easier.

”These angles on the risers are also showing on opposite sides, which makes it difficult to machine even with a 5-axis. This depends on offcours of the machine setting.”

I do agree with you to a certain extent. if your going to cnc machine angled risers your going to have to make the 5 axis work. 99% of the times the risers are going to be the same angle at both ends (the 1 procent being a irregular shaped staircase, or if the corner step enters the above flight stringboard.)

I do like the idea of flipping the riser dont get me wrong, but having the programm makeing machineing the way that it does, confuses me. It makes no sense for the motor being on the ”inside” of the riser where when it becomes too steep it will make a problem 100%. i mean if you make it millling from the outside this will never be a issue and is aswell much safer. as well as that ,why not implementing a mirror function insted for right and left side? ( befor flipping finish the left side of the riser and after flipping finish the right side) ( and in the case of being a irregular staircase you cancel the mirror function and flipping function? ) in this case u can work the  hard angles from the outside, while working on the ”underside” (right or left plane) and going from left side to right side you cut it to length at the same time with the second milling.

Then there would be no need of having the assembler to sand the risers to fit (and in the case of the assembler accidentally striping too much paint off and having to repaint/repair the riser.

”Can you tell me how you machine a riser like that, as these small angles are on opposite sides from each other?”

Well what we do is that we machine the risers finish befor assembeling. we place the underside of the step upwards, place the riser for the step in the groove,, place it to one of the sidesand meassure double the dept of the groove in the stringboard and mark that from the other side. this gives us the length of the riser. from there we take the angle of the step and cut the riser on the table saw. to get the other angle small angle we mark the depth of the groove and handplane it down with a small blok plane.

This is a way that i personally dont like, since if you make a mistake the riser isint as ”pretty”. In our case it just make way more sense to cnc mill it (almost 2 to 4  hours for the manually do them all and under 30 mins for the cnc).

”Do you have issues with both of them or only 1 ?”

its on both sides since the small angle is mirrored and the milling is on the inside.

”The development of this feature would cost 1260 euros which is an amount to consider if you want to spend it”
Insted of the development of that feature, would it then be possible to change the milling from the inside to the outside in the programm with an update. since then ofcourse this would never be a issue with other costumers aswell (ofcourse if thats not possible, then how much would a development of a feature with the left right milling and milling from the outside insted cost ?)

”Can you send a video of how you process such a riser on the CNC?”

I dont have a staircase at the moment with risers but i can send a video of a simulation if thats okay ?

Regards

Michel 

Hi Michel.

We’re new in the field of making staircases with a CNC, so we havent seen as much how people useally produce their staircases with a cnc. So i just figured that the risers would be produced as well with a cnc. 
If you dont mind me asking, how is it normally done ?

”Another approach in the software is to manually rule out the perpendicular penetration for specific steps so that there will not be an angled side on the riser. The machining will be restricted to a calibration only, which raises the question, is it economical to do this on a CNC? ”
 
im not quite sure in understand what you mean inn this case ?

”I will revert back to you once I get the reply on the development cost in case you need that option anyway.”

Super thank you very much.