Quote Originally Posted by Boyan Silyavski View Post
I agree, GDZ on their 5kw GDZ125-18Z/5.5 spindles say bearings for half year, other parts for one year
. Which i see as a perfect engraving spindle for DIY projects. They come with 2*7007C P4
2*7005C P4 bearings.

So spindle is consumable, at 500$. One pays it off on a couple of jobs and then when broken, bearings are to be changed. bearings are at around 100$ the pair, so
its quite doable and i see it as an solution.


Again, not for cutting, just for shallow jobs. I kniow what you are saying, i have the diamond bits but still have not done that on mine machine, not that it wil not do it, but dont want to loose precision or hack the bearings. But if a job that pays well comes, i will do it.


What i am saying it is a viable solution to start the business and make money. A mill head could be used also , but i dont see the point.
We are on different wavelengths here. I'm talking about a machine that will be used in a business environment solely dedicated to cutting and engraving all types of very hard materials, stone, marble, granite working 5-6 days 8-12hrs.

The last thing any business want's whether it's a new or long-standing business is unplanned downtime or continuous unreliability. These spindles are simply just not up to the job for what's described above. Changing out the bearings isn't something a hairy arsed stone mason wants or needs to be doing or even swapping out spindles for that matter. Which he would be doing often with these spindles.

I'm dealing with small business users all the time and just half a day of lost production can cause them major problems with both finance and reputation.
It's the holy grail of machine-building to me that reliability trumps all other aspects because it doesn't matter if it's the fastest machine or the largest machine or the strongest machine that gives a perfect finish because if that spindle isn't turning it's not making money.!! . . . And that applies to both large and small businesses.