DP replacement motor recommendations on Clausing 20"

[Bachhus]

Hoping to get some experienced recommendations. I'm buying a used Clausing 20" 2277 with a 3ph 460v (only) motor. It already has a 460v VFD with it, apparently he was told that this VFD could run this machine off 220v 1ph which it didn't.

I have 220 1ph in my garage. I've researched and read all over about VFD's etc, step up transformers which seem to be way out of my price range. So what seems to be the most economical solution is to by a single speed 3ph motor and run a VFD.

Now the need for your experience, I'm seeing (1.5-2hp) 1750 rpm, (3/4hp) 1150 rpm, (3/4hp) 850 rpm motors as options. This will be used primarily to drill metal, maybe the occasional wood but 95% metal. Would I be better off with the slower RPM and less hp motor and then slow that down further with the VFD for cutting larger holes or on tougher metals? or higher hp faster rpm motor and just slow it down as slow as I need to with the VFD? I know when you slow it down with the VFD it cuts the hp available from what I understand.

Hope that made sense
Thanks for any input!

 

[Davefr]

I'd go with the 1.5 HP 1750 RPM 3 phase motor and a Teco VFD. Set your DP's speed dial at the highest RPM setting and let the VFD do most of the speed control. With that HP motor you'll still have a lot of torque down low. And if you need more torque simply dial down the variable pulley speed control wheel.

I had this setup in the past (Baldor 1.5HP 1750 RPM) and you could get unstoppable torque at single digit speeds with no sacrifice at the top end. In fact you could even overclock the VFD to squeeze out more high end RPM then the native machine could.

 

[seber]

The fact that he put a VFD on the machine would indicate that the built in VS system is defunct. Pretty common on that DP. If so, you will need a big enough motor to still have sufficient torque at very low rpm. If the VS really is not working, then you need to look at the torque rating of whatever motor you decide on. Half speed and half power equals the same torque.

 

[shawhite]

Assuming the variable speed reeves drive is functional I would go with a single phase 1.5hp Baldor and use the variable speed on the machine. May even be able to pick up a used clausing single phase motor on eBay for cheapish. Might want to contact clausing with the serial number and verify they motor can not be wired for 220. Some of the motors on the 20 are dual voltage. Also I would go with the slower speed motor since you said you will mainly be drilling metal.

 

[Bachhus]

The fact that he put a VFD on the machine would indicate that the built in VS system is defunct. Pretty common on that DP. If so, you will need a big enough motor to still have sufficient torque at very low rpm. If the VS really is not working, then you need to look at the torque rating of whatever motor you decide on. Half speed and half power equals the same torque.

The seller said he bought the VFD to put on it because a "buddy" had told him it would work to run the 460V motor off his 220 single phase. I'll verify the original variable speed system is in good working order before finalizing the deal though.

 

[Bachhus]

Assuming the variable speed reeves drive is functional I would go with a single phase 1.5hp Baldor and use the variable speed on the machine. May even be able to pick up a used clausing single phase motor on eBay for cheapish. Might want to contact clausing with the serial number and verify they motor can not be wired for 220. Some of the motors on the 20 are dual voltage. Also I would go with the slower speed motor since you said you will mainly be drilling metal.

Thanks, I had been looking for a single phase motor originally but there are not a lot of options in my area at least. New its well over $1K, not a lot of used options, been looking all over marketplace, ebay etc. The original motor on this one is a 184 frame, not the more common 184T so that doesn't help much. a 184 used 3phase can be found for around 3-400 at the moment so thats why I'm leaning that way.