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Is part the issue the silicone seals that keep junque out of the bearings ?? We have tons of linear rails/bearings at work and when the bearing blocks are new sometimes the seals are pretty snug. Do...

Yeah Al, my thinking was that if I replaced the VFD with a 2hp model the resistor would stay with the mill.

Bill

I think eventually I may add the dynamic braking module anyway.....

Just pondering if I need the 5hp dynamic brake module for my application or if the 2hp one would work.

I pretty much decided...

There was a rev number stated in the instructions for the external DC brake manual, it is on the heat sink, I have not yet looked at my drive to see if it is past that rev number.

I read over both...

Mine is an AC tech 250Y

It has a built in braking resistor, and an overheat detector for said resister.

There is some info in the manual about setting a timer for the drive to "go to...

My drive is rated for 5hp on 220 single phase or 3 phase, NO derating required for single phase input. Some older drives require derating, this drive does not, and is specifically designed to provide...

Well the rate of decel can be adjusted by parameter, and the drive is really doing no more work to decel, and reverse than it is to just decel and STOP is it ?? Plus remember this is a FIVE hp vfd...

OK I will explain how it is wired up to save any further confusion.

Line power in, 220 single phase goes into the VFD(I will wire a contacter in between to shut the whole thing OFF when not using...

No AL.

Originally line power went thru the drum switch to the motor. Now the motor is wired direct to the the VFD outputs.

I used my ohm meter to find terminals in the drum switch to work with...

The motor on a Bport I just installed a VFD on was making a whining noise, I changed the carrier frequency from 6kHz to 4kHz and the slight whine is only present on acel or decel now.

My drive is...

http://www.wolfautomation.com/Product.aspx?ProductID=18805

I bought the above VFD in a 5hp model, I had a grizzly lathe on order that had a 4hp 3 phase motor on it. Got tired of endless back order...

http://www.grizzly.com/images/manuals/g0509g_m.pdf

Page 54 has a picture of the control cabinet inside

I see the coolant pump is a 1/8 hp 3450 rpm 3 phase motor too.......another 190 bucks for...

Yes it is a gear head lathe, however it's lowest speed is 45 rpm, this would be with the motor running 875 rpm. The lowest speed with the motor running 1750 would be 90 rpm, which might be too fast...

http://www.cnczone.com/forums/showthread.php?t=25061

This thread answers part of my question



So I SHOULD be able to use both speeds of the 2 speed motor :-)

I would like to buy this lathe

http://tinyurl.com/34ufcb

This is the motor info

Type 2 speed induction
HP 3-4
Voltage 220
Prewired 220

https://sdp-si.com/

I would like to do a 10x20 cnc myself. Can you use a 5c collet with these lathes ??

What type of accuracy did you get with your other conversion ??


Bill

I have spoken with many many co-workers that could not run a thread in a lathe, yet proclaimed themselves to be artistes at the trade of machinist.....in fact may could not run a lathe PERIOD....and...

I would be willing to bet that MOST people that think it is unimportant cannot do it nicely, and the reverse is true also :-).

What if we modified the question to ask if a good machinist should be...

Honestly Al I'm not afraid to buy a NEW VFD for this app. Even that would be far cheaper than the rotary phase converter Grizzly specced for this lathe.

Wiring the VFD might be a bit scary for me...

http://www.grizzly.com/catalog/2007/Main/534

they refer the potential buyer to a 15 horsepower rotary phase converter that grizzly sells for $1750 ?? sheesh, that is a deal breaker. Can I use a...

I have used Norton commander on older computers that ran DOS and win3.11. There is a freeware analog called "Midnight Commander" that runs in DOS and I bet windows now, all they are fancied up DOS...

Axis rotation (G68 on the machines I ran) is sure a neato thing isnt it ?? once you start to really use it it can be very powerful, I used it all the time for rotated features. For example an...

I mean other than the cutter comp right/left issue (been so long since I ran the jobs I am rembering I do not recall if they HAD cutter comp even)

The effect I mention could be illustrated by...

From my own experience keep in mind that most endmills will cut a differant size when using mirror, due to the non mirror part being climb cut, and the mirror part being conventional cut(or the...

Rather than mill the 1/4" off, what I did where I could, and you often can, is mill the profile as you described...then do all other machining in that op, then use a woodruff stype 1/16" wide...

I'm running a seperate PC power supply(in my control box) This will provide the 12vdc and the 5vdc My C11g board requires, and the 5vdc for the gecko's. Some folks use Wal Wart transformers, but I...

Most makers of cutting tools I have worked with say for best tool performance it is best to use an ER collet that exactly fits the tool not a "range" collet. It is in fact easier to "feel" that the...

Also depending on what the hole is for, does the .04" dia have to be the whole depth ?? or can it be started a larger size ??

A ball endmill MIGHT leave a nice start too, they do really really...

>>>>>>>>>>>>>>>>>>>>>>>>>>>>
RPM = (3.82 x SFM)/tool dia
>>>>>>>>>>>>>>>>>>>

RPM=(4 x sfm)/dia is easier to remember, not as precise, but the error is on the side of caution...............