[Noteworthy] VFD & BP Series 1 speed adjustment

Yup, I hear what you're saying;)

Direct drive means removing the mechanical variable speed hardware, and replace it with fixed pulleys.
http://www.hobby-machinist.com/threads/mill-spindle-direct-drive-conversion.49130/



No, that's a static phase converter

Ah okay, so I guess I hadn't heard anything about them.
I can assure you that I will not be converting it to a direct drive LOL. That is way too much work, and, I havn't even got a chance to use the mill yet. I installed the VFD no problem, I just need to finish programming it.

Remember in one of my other posts where I made the schematic for the table screw extension that I bought? I got the power feed installed to about 80% complete. The extension was sliding back and forth on the screw even with everything installed and tight. So instead of drilling/taping/blah blah I bought some thrust bearings and various shims (so I didn't have to place any more orders) to stop the lateral movement. There is a woodruff key in place to stop the extension from spinning on the screw. It's a cheesy fix, but it was physically easier for me.


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Axemaker,

My mill is set up as you are trying to do. I use the VS to set the basic range I will be working in and do fine adjust with the VFD from there. Most times the VFD is at 60 hz but my mill is noisy at the lowest VS speed setting due to belt wear so I tend to move to a spot above that and use VFD to lower the speed from there. A good example of when the VFD speed control us nice is when drilling and then power tapping. It's faster to lower the speed via VFD than to switch to back gears on my mill.

One thing to be aware of is when you are lowering the speed (using the VS mechanical speed adjust) from say 1800 rpm to 800 rpm you can get an over speed error on the VFD if you try to change the speed too fast. Adding a braking resistor will fix this if your VFD allows it.
 
Axemaker,

My mill is set up as you are trying to do. I use the VS to set the basic range I will be working in and do fine adjust with the VFD from there. Most times the VFD is at 60 hz but my mill is noisy at the lowest VS speed setting due to belt wear so I tend to move to a spot above that and use VFD to lower the speed from there. A good example of when the VFD speed control us nice is when drilling and then power tapping. It's faster to lower the speed via VFD than to switch to back gears on my mill.

One thing to be aware of is when you are lowering the speed (using the VS mechanical speed adjust) from say 1800 rpm to 800 rpm you can get an over speed error on the VFD if you try to change the speed too fast. Adding a braking resistor will fix this if your VFD allows it.

Hi Sanddan,

Thanks for the info! The Lenze has the ability to install a brake resistor & network jack as an option. If I remember correctly the brake resistor is around $14.
 
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