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-   -   Welding Table Legs - Othello, USA (http://www.mechmate.com/forums/showthread.php?t=2200)

weldnh20 Mon 12 October 2009 20:08

Welding Table Legs - Othello, USA
 
Copied from elsewhere:

I started my build last weekend, this will be a monster when it's complete. I got most the electrical figured out except the transformer.Looking at pictures and all the different drawings it would be nice just to get a part number and supplier and be done.
Dan

jhiggins7 Mon 12 October 2009 20:16

Dan,

The transformer choice depends on which Stepper Motors you are using.
I used the Antek transformer and built my own power supply because I needed two voltages(two different Stepper Motors).

If you are going with a pre-built power supply(not building your own), just tell us what Stepper Motors you are using, and we can give you some suggestions for part numbers.

weldnh20 Tue 13 October 2009 18:59

John,
Did you use different size motors for the Z & Y . I was looking at th Oriental motor # PK296A2A as recommended

weldnh20 Tue 13 October 2009 19:02

I got the v groove bearings today,and went over the plasma cut parts with a friend of mine.This weekend lots of stuff should come together

jhiggins7 Tue 13 October 2009 19:51

Dan,

I used 3 USED OM motors, 1A1 with 3.6 gears. I used one NEW PK296A2A-SG7.2. I put the PK296A2A-SG7.2 on the Y-Car. The others for the rest.

Your selection of PK296A2A motors is an excellent one and this is what I would have used had I not got the chance to buy 3 USED OM motors, cheap. Many MechMate builders have used the PK296A2A-SG7.2 motors very successfully.

Have you looked at the Antek product offerings? I found them to be very helpful and the products good.
They even provided suggestions on a schematic for a dual voltage power supply design.

weldnh20 Tue 13 October 2009 20:44

John,
Why is it necessary to cut the angle iron down, I purchased 3x2 angle and couldn't figure out why cut. if the z moves up and down whats it matter.

FAQ candidate

weldnh20 Tue 13 October 2009 20:50

Haven't looked at power supplies and transformers again. I'm excited about putting all the parts together and pushing it around. I need to study and research motors, transformers,and software a bit before I go blow 2k

Alan_c Wed 14 October 2009 00:29

If the tracks are not cut down to the specified height, the motors will not swing low enough to reach the racks. To make that work you would have to change at least 7 other components to suit the higher track. Higher tracks would also possibly allow more movement/flexing. Trust us there is a reason for everything being as it is...

jhiggins7 Wed 14 October 2009 07:07

Dan,

Okay, Alan answered the question about cutting down the rails while I was sleeping. Thanks Alan.

And regarding...

Quote:
Originally Posted by weldnh20 View Post
... I need to study and research motors, transformers,and software a bit before I go blow 2k
EXACTLY! And also, when you assemble the Control Box and start testing, you will know exactly how it is all supposed to work. If there are problems, you will be in a much better position to troubleshoot them.

weldnh20 Wed 14 October 2009 17:44

Thanks guys, I understand. I'm going to try and use my plasma to cut the angle down. Then make a grinding jig. I was wondering how come everyone uses hard stone for grinding instead of a flap disk. Flap disks cut faster and smoother

domino11 Wed 14 October 2009 19:23

Someone here tried to have the rails cut down with plasma and just ended up with useless warped rails.

weldnh20 Wed 14 October 2009 19:45

Heath,
I'm surprised, I'll try on a piece of scrap first and see. Otherwise I will just use a cut off wheel.

jehayes Thu 15 October 2009 10:34

Plasma Vs. Cut-off wheel
 
I used the cut-off and the angled skate for the 45 degree cuts and had no problem with either. The cut-off wheel went very quickly and was very accurate (assuming you have a solid, flat base on which to place the sled) and the angle grinding went well once I figured out the need to have the leading edge of the grinding wheel as the contact point. BTW - I angle ground my Z-plate this weekend using the same system - no problems. Hope this helps

Joe

weldnh20 Thu 15 October 2009 20:23

Thanks for the help guy's. I'm amazed at how much information is available on this site. I took a 3 day weekend to start putting together all the money I spent. Have to keep telling my wife it's not a toy. Don't think she's convinced. Over the years it's getting harder to convince her.
Dan

Robert M Thu 15 October 2009 20:45

Hen….lucky you, you still able to convince her a bit..... nooooot here :o

Kobus_Joubert Thu 15 October 2009 22:28

When you start producing things for her, it all falls into place...so just wait until you are making dust.

weldnh20 Fri 16 October 2009 19:41

Started welding today. Made first mistake of many to come, Cut the frame out jigged it all then started tacking together. Brainstorm,wondered if a 4x10 sheet of plywood available. Well 50 mile trip to town later and it's a problem to get, Cut the tacks off now it will be cut area of 4x8. I'm sure it's overbuilt but I had some off the material left over from a job. X rails are 3X8x3/16 square tube.

weldnh20 Sat 17 October 2009 16:55

Started welding the legs in place today, should be able to flip it over on sunday. While doing some touch grinding I realized that a hard stone will be better to grind the rails. A flap disk will flex a bit and may cause an uneven surface. I was wondering, people talk about gluing the spoil board to the base board. When the spoil board needs to be replaced how do you remove it?

Gerald D Sat 17 October 2009 20:38

The spoil board wears away with time. When it gets grubby, you take a light cut over the whole surface (called "re-surface" or "surfacing") and so it gets even thinner. When you get near to the old glue line, you re-surface and glue the next one on top.

(FAQ candidate)

weldnh20 Sun 18 October 2009 14:34

Legs are on, so far everything is holding square

jehayes Tue 20 October 2009 16:09

Re: the Spoilboard - Has anyone tried using the same double sided tape used for the racks to hold down the base board onto the cross rails? Would this work? (Assuming the cross rails are welded for stiffness rather than bolted) Just a thought

Gerald D Tue 20 October 2009 23:00

I think it will work well if you can get a good bond between the tape and the board.

weldnh20 Sun 25 October 2009 15:42

The table construction is complete. Just waiting for the formed parts then will start on the gantry Y car. I want to order the PC this month. Does anyone have any recommendations?

jhiggins7 Sun 25 October 2009 18:13

I bought a used Small Form Factor PC from these guys.

It came with XP Pro and was ready to run. In addition to the price of the machine I paid shipping and taxes (they are located in Texas) for a total of $114. It arrived a couple of days after I placed the order.

The computer is shown in this post from my build thread.


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