The cost to re-tool for an upgraded rotor for just a few specials wont be worth the expense in relation to demand.?
How did you fit a larger ER collet taper system into a smaller ER taper.?
I don't think it would make that good a spindle for a lathe, unless the lathe is very small, since it uses angular contact bearings. Most lathes use tapered roller bearings since their load ratings are much much higher. Angular contact bearings are the only bearings suitable for high speed and axial loads, but you don't need that high a speed on a lathe (unless it's something special) so why compromise the rigidity so much by using the wrong bearing type. Same is probably true for a spindle for cutting steel since again that's low rpm and you need higher rigidity for cutting steel.
I assume that the spindles are made on CNC equipment and it's probably not going to be straight forward to redesign the rotor with a larger nose to accept the larger diameter ER collets and nut that would be required to go from ER 16 to ER 20 for instance.
As I said previously, the manufacturer may be prepared to make a "one off" but I would think that the cost would quite high.
Is it not a case of just ordering the CNC3040 with a larger spindle to cover a larger range of sizes? The 2.2 kw spindle can handle up to 1/2" and is man enough for most jobs including steel milling. I would have thought that this would be cheaper than getting a lower powered spindle but with a bespoke larger collet size.
True, but even better would be to just couple it to a brushless RC motor and keep it as a high speed spindle. With the right motor it could be better than new...something like this:
Assuming you can find tapered roller bearings the same size, but that's rather unlikely as I think those spindles use a pair of 70xx series bearings?
I've found it's not really man enough for steel milling. I've made a couple of bits from mild steel with my cnc router and that spindle, but the problem is the torque at low rpm for that type of spindle is so low that you're limited to only very small cutters and running them a bit fast. A VFD with vector current control would help matters, but it's still going to have limited torque and rigidity.
If you actually want to cut steel regularly you need a lower rpm spindle and a much stronger machine than a CNC3040!
Yes using standard milling cutters and techniques then yes they are way too fast but with correct high speed tooling designed to run dry and high speed milling techniques then they work fine in steel. The down side being the cutters are expensive and it can take longer because you can't hog big lumps out but it still does a good job without stressing the machine or spindle.
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