Thoughts on Sorotec alu-line machine

[JAZZCNC]

#4. How are they mounted together? And what about using something like a 100x200 profile? I guess that would be of similar strength as the L-shape made by 80x120, but easier to use.

They are bolted together from the bottom as mentioned in the last post and end plates are machined with L-shape pockets to match the profile then bolted to the ends to support the ends.

#5. This is interesting. So without a flat surface to rely on, you probably would have to go with epoxy resin leveling?

Yes, the first version I made used epoxy leveling until I aquired the large surface plate. Epoxy works ok it's just more work and takes a lot longer. The method I use now is dry within hours and can be drilled tapped the next day and rails fitted. You cannot fit rails on epoxy for at least 2 weeks.

#6. Of course, why did I not think of that immediately? Oh well, it makes sense now. Is it much more difficult to get it aligned like that, compared to mounting both on the front?

Yes and no. Yes because the rails are not on the same plane so a little more work with a dial gauge to get parallel etc. However, it does offer other advantages regards setting up the Z-axis vertical tram because you can slide the rails back n forth ever so slightly if needed, plus you the X-axis top plate which can have a little adjustment in it. More adjustments the better when it comes to building a CNC machine but Obviously within limits so as not to put a binding on the linear bearings.
Where if you have both rails on the same plane and the Vertical tram is out then you have to mess around with shims or tilting the gantry etc. Worse still if the gantry as got any twist in it because then it's not so easy to get twist out. With rails on top you can take the twist out easier.

#7. So you are drilling holes through the profiles for the bolts?

Yes, counterbore the slots to make a flat area for bolt head and then drill and tap into matching profile. Depending on profile type depends on how far into the profile I drill and counterbore.

Bonus question: How much approximately do you sell this type of machine for? It looks really good and it sounds like a lot of fun to be making money building CNC machines!

Yes, it's a lot of fun and frustration at times. As for making money that's a different matter... Not so sure I really do at times...