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  #511  
Old Mon 31 August 2009, 10:11
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
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Gerald it's an older Delta variable speed drill press (rpms controlled be turning a lever). I would like to use up to .5" taps. My question is .... with the manual speed set to 300 rpms (now 600 rpms) will I be able to set (with the vfd) the rpms low enough to easily tap?? By the way, the motor is totally enclosed and has an external fan. It's the 1.5 hp 3 phase motor that I will be running off of the 1 hp 3 phase vfd.
Should I look a 1725 rpm motor?
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  #512  
Old Mon 31 August 2009, 12:53
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
JR, I don't have a gut feel for how low the gearing/belting on that drillpress goes, but I do know for a fact that a 4 pole motor has double the torque of a 2 pole motor (both motors at the same HP).
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  #513  
Old Mon 31 August 2009, 23:05
Doug_Ford
Just call me: Doug #3
 
Conway (Arkansas)
United States of America
JR,

What does your VFD owner's manual say? If I remember correctly, my VFD will only allow me to set the minimum hertz to 30; however, I seem to recall that there is a way to override that minimum. If you haven't bought your VFD yet, lots of places will let you download owner manuals from their websites.
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  #514  
Old Tue 01 September 2009, 07:37
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Doug I do have it. It's a Allen-Bradley PowerFlex 4 Cat # 22A-B4P5N104. I'll check the manual and report back. Thanks
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  #515  
Old Thu 12 November 2009, 10:23
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
This is a link to the site where Donnie Parrott and a friend are building their first 2 cold mold boats. This is the 19' boat kit I cut just before going to Hawaii. We talked about it in post # 487. They made the second kit by copying the first .......... I think I could have saved them some time ???

http://www.thehulltruth.com/boating-...r-project.html
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  #516  
Old Fri 13 November 2009, 12:03
jehayes
Just call me: Joe #53
 
Whidbey Island, Washington
United States of America
Dat link don't!
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  #517  
Old Sat 14 November 2009, 09:58
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
That link does work, but I found that the pics load slowly.
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  #518  
Old Sat 14 November 2009, 11:24
lumberjack_jeff
Just call me: Jeff #31
 
Montesano, WA
United States of America
Fun!

Very nice work JR.
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  #519  
Old Wed 18 November 2009, 12:15
Claudiu
Just call me: Claus #43
 
Arad
Romania
Hello Guys,

I was reading your updates about the 3 to 1 motor reduction. Very nice piece of work.
I`m going to use OM 7.2`s, which I already chose.
I would have liked to know if it is possible to take the Gear Head simply off?
So would it be then possible to experiment around with belt drives?
Which leads me to: Is it possible to make a 7:1 belt drive?
Maybe with two belts if the diam get to big!

It`s a thought only to minimize backlash ?!
Ideas?

Bye
Claus
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  #520  
Old Wed 18 November 2009, 12:22
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Quote:
Originally Posted by Claudiu View Post
I would have liked to know if it is possible to take the Gear Head simply off?
See

What does a stepper motor look like inside? (geared Oriental Motor)
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  #521  
Old Wed 02 December 2009, 09:41
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Gerald I couldn't find the right thread. Please move if need be.
This is a follow up to the discussion started on Roberts thread..........

I took a look at my machine and realized the "motor mount/spring holder" will not work flat because it will foul the router, therefore I agree with Gerald and Leo, it is too complicated for the improvement it makes. However I have always thought the Z motor mount bracket on the spider is a pain in the butt to get aligned correctly when welding. Please take a look at the mod below and see if it's worth the effort??? Thanks J.R.
Attached Images
File Type: jpg spider with motor mount jrh mod.jpg (30.3 KB, 2356 views)
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  #522  
Old Wed 02 December 2009, 13:01
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
J.R., that is a tricky one because there is a bend through the slots and thus the width of the slots mating with the spigots of the plate (that could be 6mm or 1/4") is hard to control. However, I am comfortable with the second slot/spigot.

For the actual welding, we drop a piece of wood between the spider's feet and the motor lug to hold it parallel to the feet.
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  #523  
Old Wed 02 December 2009, 15:03
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
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I was assuming (I need to be careful here ass.u.me thing) the 2 slots even though 1 is open ended, would react the same in the bend???
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  #524  
Old Wed 02 December 2009, 21:04
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The effective width of the bent slot depends on who is doing the bending and the plate thickness/grade, so we have to specify a generously wide slot which is going to be fairly loose for some people.
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  #525  
Old Sun 06 December 2009, 03:20
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Here are some nice pics of the job done by Claus in Romania.
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  #526  
Old Fri 25 December 2009, 05:58
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
To all that celebrate Christmas ....... MERRY CHRISTMAS
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  #527  
Old Fri 25 December 2009, 13:36
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Merry Christmas JR!
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  #528  
Old Wed 13 January 2010, 09:58
toad
Just call me: Toad #80
 
Burlington NC
United States of America
Good day Mark;



Been reading your post and I for one am interested in the belt drive you built. Very impressed, I have been looking for 3 of these, how much are you asking for them?

Toad
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  #529  
Old Thu 04 February 2010, 21:33
TURBObuck
Just call me: Robert
 
Garner (NC)
United States of America
JR, I am starting down the road to building my MM. I am currently educating myself and trying to determine all parts needed to start with a simulator setup. I noticed you are in Wilmington, I have to go to the Brunswick plant on Monday and would love to take a look at you machine Monday afternoon if possible. I got your info from your cnc-nc website and will call tomorrow. Any help would be greatly appreciated. Robert
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  #530  
Old Fri 05 February 2010, 14:08
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Have contacted Robert by phone and have setup a meeting for Monday.
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  #531  
Old Sat 15 May 2010, 03:33
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
This message came to me via email. I would like to answer it here also.

"JR,

I'm just starting on the MechMate journey. One of the things that I really can't decide on is Geared OM7.2 vs cheaper motors with belt drives.

I've been reading some of your posts and notice that it's been a few years since you've had the belt drives running. So I was wondering if you are still happy with the belts, or if you were to do it again would you go for the OM7.2

I guess I'm looking for a nice clean cut (apparently you get this from the geared) but also minimize the backlash (belts).

Thanks,
Colin."
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  #532  
Old Sat 15 May 2010, 03:37
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Colin, I have never touched the belt drives since the day they were installed not even to adjust the belts. I am going to build another Mechmate soon and there isn't anyone that could talk me into gear drives, even at a giveaway price .... it will always be belt drives for me. I hope this says it all. J.R.
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  #533  
Old Sun 16 May 2010, 13:00
toad
Just call me: Toad #80
 
Burlington NC
United States of America
J R
Did you make your belt drive, or purchase them somewhere. If you made them, could you let me know where you purchased the parts.

Toad
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  #534  
Old Mon 17 May 2010, 06:05
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Toad and anyone else that needs the 3:1 tranny parts.

Material List:

SDP/SI part numbers:
Drive Pulley: A 6A 3-15DF03716 4 $9.84/Each $39.36/Total
Driven Pulley: A 6A 3-45NF03716 4 $17.42/Each $69.68/Total
Belt: A 6R 3-054037 5 $4.73/Each $23.65/Total (1 extra belt)

The driven shafts were fabricated out of .5 in. x 3.5 in. cold rolled steel rod.

Bearings: 1.125 OD x .5 ID x .375 (Part # 1616ZZ) sealed ball bearings from VXB (KIT 958) Qty 10 $24.95

Aluminum Stock: .5" X 4" X 12" per tranny (bar stock).
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  #535  
Old Mon 17 May 2010, 09:49
toad
Just call me: Toad #80
 
Burlington NC
United States of America
JR,

Thanks for the info,
Do you have contact info for the supplier?
Toad
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  #536  
Old Mon 17 May 2010, 12:03
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
http://www.sdp-si.com/web/html/drivesystems.htm
http://www.vxb.com/ballbearings.html...FQNinAods36UIg
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  #537  
Old Mon 17 May 2010, 19:10
toad
Just call me: Toad #80
 
Burlington NC
United States of America
Thanks, I saw it right after I sent the post, couldn't see for looking.

Thanks
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  #538  
Old Wed 07 July 2010, 07:44
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
I just wanted to tell everyone why I like Gecko drives soooooo much. I have a homemade CNC wood lathe, it runs on Gecko 201 drives, that are over 5 years old. I had a power surge in my shop several weeks ago. I tried to use the lathe a week or so after that and it would not work. During trouble shooting I found 1 of the 201 drives was not working, so I replaced it with a spare 203 and everything worked fine. I sent the 201 to Gecko for repair. It was repaired and returned with this note.

"Out of warranty Step Motor Drive Return was inspected and tested. An unexpected failure of one of the components was found. The component was replaced and drive repaired. Inspection/testing/repair/return shipping free of charge as a customer courtesy."

This is why all of my future machines will run on Gecko Drives. Thanks Mariss for such a great drive and more than excellent customer service. J.R.
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  #539  
Old Wed 07 July 2010, 08:22
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Ditto JR.
Customer service at GECKO is so far above par, I just don't go looking anywhere else.

Thanks for sharing.
Sean
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  #540  
Old Wed 07 July 2010, 09:11
javeria
Just call me: Irfan #33
 
Bangalore
India
JR did you ever share the pics of your CNC lathe???
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