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Forum topic by Bigkahunaranch posted 06-21-2019 11:54 PM 896 views 0 times favorited 8 replies Add to Favorites Watch
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Bigkahunaranch

138 posts in 2067 days


06-21-2019 11:54 PM

I love building router tables, built 11 in the last 10 years. Usually end up selling them and starting a new one.
My latest creation is a heavy monster. I had a buddy that had an older Osnrud over arm router. He didn’t want the
cabinet so he gave it to me. I added a cast iron top and a Milwaukee 8625 router. She’s a beast.

Anyway, I’ve been looking at router lifts, more specific, power lifts.
WAY too much money.
So I’m thinking, why not use a Z axis CNC Assy???
I can get one with 400 mm of travel and 1.2 N.m of holding power, for a little over $100.

My question is: will the 1.2 N.m support a 3 1/2 hp router motor while running ?
As for the stepper motor they are NEMA 23.
Could a guy wire that up to a three position toggle style switch
??
One position for forward, one for reverse and one for off ???

So just looking for a little insight.
Thanks

-- Living the american dream in central Texas !


8 replies so far

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ArtMann

1445 posts in 1374 days


#1 posted 06-22-2019 03:55 AM

Stepper motors are controlled by pulse inputs. They rotate a very tiny portion of a circle with each pulse. A simple switch is not sufficient.

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Bigkahunaranch

138 posts in 2067 days


#2 posted 06-22-2019 04:13 PM



Stepper motors are controlled by pulse inputs. They rotate a very tiny portion of a circle with each pulse. A simple switch is not sufficient.

- ArtMann

Thank you Art, I was afraid that may be the case.
Oh well, back to the drawing board as they say.

-- Living the american dream in central Texas !

View Ger21's profile

Ger21

1089 posts in 3689 days


#3 posted 06-30-2019 07:08 PM

You can buy simple pulse generators on EBay that will run a stepper like you want.
I’d go with a bigger motor, though.

-- Gerry, http://www.thecncwoodworker.com/index.html http://www.jointcam.com

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DS

3343 posts in 2978 days


#4 posted 07-01-2019 06:55 AM

+1

The trick is to get an MPG (Manual Pulse Generator) and a driver so you could lift in predictable and repeatable steps.

BTW, nothing wrong with a Nema 23 motor if you are geared down, such as the case with a ball screw.


You can buy simple pulse generators on EBay that will run a stepper like you want.
I d go with a bigger motor, though.

- Ger21


-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

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ArtMann

1445 posts in 1374 days


#5 posted 07-01-2019 09:22 PM

I have seen a design for a router table lift that used a cheap cordless drill and a threaded rod to move the router up and down. If you are cost conscious, I don’t see why you would need a stepper motor and pulse controller when threaded rods and drill motors are so cheap and easy to come by.

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Balloonengineer

11 posts in 3742 days


#6 posted 09-10-2019 03:18 AM

A little late to this topic, but if you use a CNC Z-axis, you should really consider using a CNC spindle as well – way quieter than any router, better bearings, built for continuous duty, no brushes, more power (my 2.2kW spindle (3 true horsepower) has way more power than those “3.5hp” routers that plug into a standard 15A circuit. A little work with an arduino running GRBL and you can build a “smart” router table, with a lift you can move in thousandth of an inch increments, and with a spindle that you can digitally control speeds from 6000-24000 in 1 rpm increments.

-- Tubular latex pressure vessel configuration engineer

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Bigkahunaranch

138 posts in 2067 days


#7 posted 09-12-2019 06:10 PM

So a fellow down here in Texas has a Bobs E3 cnc for sale.
He bought it, used it for one project and is now selling it.

He’s asking $600, no computer or software.
Is that a fair price ?.

For software (free) I’m looking at Fusion 360 and or Easel.
I want to be able to do drawer boxes, with dovetail or box joints ??
What size bit would I look for ?

Also would like to do some 3D carving like a lion or horse head. 3D stars etc.

Am I going in the right direction ??

Thanks
Dave

-- Living the american dream in central Texas !

View DS's profile

DS

3343 posts in 2978 days


#8 posted 09-13-2019 06:02 PM

Seems like your goals for this project are changing.
It is a symptom of a greater illness, from which, I seem to suffer a lot.

To your post, there is a big big difference between routing dovetails and 3D carving a lions head.

Mostly, the differences are 1) Fixturing of your part and 2) Software capability, are radically different. A dovetail joint is a basic tool path geometry (2 1/2D), while a lion’s head is a rastered 3D image path.

There is obviously some tooling differences, but that is fairly basic. You would use the same dovetail router bits you might otherwise use to router dovetails in manual dovetail jig, while the raster scan would use ball tip bits.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

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