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    magma-joe,

    I forgot to mention the $avings too, twice the rail and v-rbearing life from the lower psi.

    It is 111f in my shop today today and I still have a few more hour s to go!

    WSS



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    111 f ... definetly beer drinkin weather....68 f in my garage... thats still beer drinkin weather....

    WSS ive been meaning to ask, and maybe its a dumb question... but how does the thc work with oxy-acet torches??

    EDD



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    Edwardo,
    I am not sure how it is going work. I know in demo mode it is all pre-set before the cut starts. I think the up n down buttons are set to move 1/16" per click. You pick the pierce height,the pre-heat time, pierce delay time, and the cut height. I believe it is set once by zeroing it. I will keep you posted when I give it a run. I think all the DT software has the oxy screen available, if you have it, try to do some mock settings and let me now what you find (pretty please). I can only run in demo mode at the moment.

    WSS



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    WSS

    I seen the icon for oxy cutting on my sceen, but i have never checked it out, if i get a chance tommorow im going to at least move my gantry around and check that gusset drawing, i got a call today to head back to work on friday, so my plans of cutting for a couple weeks just got blown out of the water again...

    EDD



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    Quote Originally Posted by Edwardo View Post
    WSS

    I seen the icon for oxy cutting on my sceen, but i have never checked it out, if i get a chance tommorow im going to at least move my gantry around and check that gusset drawing, i got a call today to head back to work on friday, so my plans of cutting for a couple weeks just got blown out of the water again...

    EDD
    Is that two rounds now without cutting? You better enjoy that 68 degree weather while you can.


    WSS

    www.metaltechus.com


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    Funny how things change so fast, as it stands now i dont have to return to work for awhile so i ordered up some aluminum for tommorow, i ran that gusset file ( dry run ) and it works perfect, 1 peirce then zig zags across the table then comes straight back across the sheet...
    As near as i can say with the oxy option you just set your pre heat time, peirce height and cutting height so im assuming its a manual thc, but with oxy you are cutting thick sheets so it will be flat and level with it being to heavy to warp... and cutting slow enough ipm that you can adjust it as you need to...

    EDD



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    Edwardo, how did you make your file with only one pierce?



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    Hi Joe

    I laid out a 4'x8' grid pattern in corel @ 4' squares to start, then using the bezier tool i drew 1 continuos line zig zagging across the 4" grid, this would cut out every second gusset on the first colum, once it cut to the far side of the sheet the same line cut straight back across the sheet cutting off the remaining gussets in the first 4" colum, then the same line ran the same way for the second colum and so on until i cut half the sheet at which time when i drew it up i had changed the grid to a 6" grid and then continued the same line through out it, each cut line was for 2 gussets side by each so there is zero waste of material, and only 1 peirce to start the cutting, after that it is one continuos cut for the entire sheet. If i ever cut it i will take some vids and post them...

    EDD



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    Edwardo, If you cut it post some pics. With that many pieces and depending on the material and thickness, I would think it might be a little warm at the end of the cut?

    My local metal supplier (Industrial Metal Supply) has a section of their warehouse dedicated to short lengths of all types of materials. One row is all gussets of differest sizes and thickness. When I was strolling the (gusset aisle) it made me think of of your file for gussets.

    It is my favorite store. They have precuts of rounds, squares, gussets, of every size, 4 x 4 sheets and a huge selection of remaments in stainless, aluminum, mild steel and other more exotic metals.

    I am curious what prices you guys are seeing from your suppliers. Here they are charging 40 cents per pound for steel rems and $1.50 for aluminum. I have been watching the commodity market for metals lately and they have gone way up. I hope they don't get back to where they were at there peak because steel and aluminum prices were so high it hurt the market for metal products. Plus it could bring the copper theives back.



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    Hi Joe

    You made a good point about over heating, it never even dawned on me!!
    My thinking was more to speed and no material waste, its a 27 min cut so i may have to break it down and create pauses for the torch to cool off, i think i read somewhere that can be done in sheetcam so i'll look it up, like you said before this is a great site to have other people look at your idea and make comments or suggestions... thanks

    I just bought 4 sheets of 5052 1/8th-4'x8' aluminium yesterday, total cost with tax was $730.00 CAD, you need to order a day ahead of pic-up and when i ordered i was concerned about scratches etc on the sheets because in the raw form may be the finish for some things i want to make, anyways when i picked it up the 4 sheets were on a pallet, layered with a cardboard cushion on the bottom, another cardboard layer on the top, a cardboard bumper around the outside edges, and a layer of paper between each sheet,
    when i opened it up at home the sheets were flawless, so that was a relief to see..
    I havent seen a place here to buy pre-cut peices like gussets or rems or end peices or anything, we have scap yards and such but i cant see me rooting around in them unless i want some rusted metal for something.
    The big shops will cut steel for you, but there prices are high with them running million dollar cnc tables that are opperating on a production scale, I was lucky enough to have a guy i met take me on a little tour of there plant were i buy my metal, they have some serious machines in there and they were cutting full on from what i seen, but everything has its place... i could never begin to compete with them, and they wouldnt want to do the cutting i do because it wouldnt be worth there time...

    so thats where the gusset idea came from, where it goes from here i guess is up to me now, designing and cutting is the easy part, finding someone to buy them is the tough part for me, marketing isnt one of my strong points but if i want to start a business its something i have to learn...

    The last time i hauled rems to a scrap yard i got 20 bucks for a pic up full... it paid for some gas going to pick up new sheets, i forget the price per pound but its not much but its on the way to the supplier...

    The gusset you seen, are they sold per pound or per peice? I have looked here to try and find prices to compare mine to, but there just isnt any, retailers that do sell new steel and aluminium in short peices buy there stock at the same place i do, then at least double the mark up, but they dont have gussets or anything like that...

    EDD



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    Edwardo, for giggles I called our local steel house and got a quote the same as yours. They call it the "good guy price", now it's hit and miss wether I get that pricing level. But he did say today I could have it for 568.11CAD (521.32usd). We are in mainstream So. Cal so the prices might be based on availability also.

    I have a question here, What magma-joe was saying about the heat:

    With no web or support to hold the cut pieces in place, how do you keep the parts from warping out of tolerance? Do you clamp the material somehow? I noticed in we-cim they have a checkbox on how to avoid a clamp. I assumed they meant ground clamp, but maybe it means "clamp". And maybe it doesn't mean avoid but rather how to work with it for warpage. I have a tendency to use a wide web in order to hold the part to tolerance. This way it only warps the width of the kerf and the parts are usually in tolerance. I have a sheet I need to cut of 3"X8"X.5" pieces with two 11/16" holes on each. It would be nice if I could use one cut for two pieces like the gusset file. Do the holes throw it out of the realm of reality?



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    WSS, the clamp avoidance feature could be anything you want to avoid a torch collision with. The We-cim program also allows you to cut in zones on the sheet. You could program the software to cut x number of parts in one zone until heat build up becomes a factor mataining tolerance and then have the torch move to the oposite end of the sheet into another zone which has no heat build up.

    Depending on the amount of cutting a, water table with the water splashing on the underside of the material could be useful. I have also used a pump up (pesticide sprayer) filled with water and manually sprayed the material during the cut to aid in keeping warpage down.

    Edwardo, when I buy my aluminum sheet I have my supplier laminate it with a PVC covering to protect it from scratches. It works quite well. You might have seen it before, it is white. Alot of the laser people use it to cut down on the reflection when laser cutting, as this afects the laser's performance.

    I cut the aluminum with the laminate still on the sheet. It does leave a small melted blackened edge in some areas but it can be easily removed with lacquer thinner. When I remove the sheet after cutting it still has the new finish. It costs me an extra $15.00 per side to have it laminated.



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    WSS
    Thats quite a price difference, last week when i called the first time they told me the sheets were $135 plus tax each, about what you are paying there, but when i ordered this week they told me $160 plus tax.... i asked about it but they said who ever quoted that was wrong, i'll check back with them next week again to make sure i didnt hosed, its my first time buying aluminium.... the other aluminium i used was given to me to try out...

    As for clamping the sheets down, i have never done that... 1/16th is the worst for warping and lifting off the slats, i had a video on utube showing me pushing down on the sheet when peircing, the DASH would eliminate having to do that but i cant justify the cost rite now. I had one sheet of 1/16th that i cut up last winter and it had 1150 peirces, i was spraying water on the sheet while cutting as a test to keep the dust and smoke down, plus to help it from warping and it worked well...with .5 inch plate i dont think you will get much, if any warping... but then again i am speculating because i have not cut up a sheet of .5, you may want to have a water supply handy to cool it off.. I know when i cut aluminium the first time the part warped on me, it was just a trial run cutting 3/16th, the peice was about 3"x12", but i was also using a 80amp nozzle and my 1250 set at 80 amps, just because it was all i had and wanted to give it a go, it was way overkill and to much heat, and no water, but it sure made a nice cut, and fast ... lol, using fine cut with low amps after that didnt seem to warp the 3/16th at all.. plus i still spray water regardless when cutting aluminium...

    Depending on how close of tolerance you need on your parts, you may have to include the kerf width with in your drawing, with simple gussets i did not as it doesnt really matter if they are exact, so they are 4" gussets minus half the kerf width of fine cut consumables on each side... i doubt cutting the holes will effect anything as they will all be cut out first and you should be able to set it up so your torch is cutting them in different areas of the sheet.

    Joe i may have not read your post right, were you talking about heat on the plate or the torch over heating? do you think a 1250 can cut @ 35 amps for 30 minutes straight with out stopping?

    EDD



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    Edwardo, I was talking about the heat buildup in the plate. As you pointed out the plasma machine's duty cycle could also be a factor. I looked in the Hypertherm 1250 manual and the 100% duty cycle rating of the machine is not listed.



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    magma-joe,
    I hope I have not hi-jacked your thread. It just seems like a good place to hang out! I really appreciate the helpful answers too.

    Edwardo, are you in a remote location or a small town? That may account for your having only one supplier and they feel empowered. It is hard to hose people too many times down here. They just move on to the next guy. Magma-joe, I think we have a industrial metal supply in so cal as well, i think I have tried them. It seems they had some really odd CRS bar stock I needed, like 2.25"sq. We have quite a few steel yards around us, some specialise in AR and others aluminum and such. I have not shopped for plate though . Most of the cutting we do our customer will supply the steel. I imagine that will change when we get up and running. Also we have a few industrial hardware stores around us. My favorite is McFaddden-Dale industrial hardware. They leave home depot and lowes in the dust. Where else can you get quenching oil, 4-40 buttton head cap screws and transfer punches at the same time?

    Have a great and safe weekend!
    WSS



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    Gantry update,

    I finally finished the master and slave motor pivot brackets and the new slave side motor base mounting plate. As you can see in the pics the original Dynatorch motor base plates have the motor centering hole offset to one side. In order to use it on the opposite slave side I had to make another plate with the hole reversed.

    The master and slave sides will be mirror images of each other.

    Attached Thumbnails Attached Thumbnails NEW BUILD / Dynatorch Upgrade-slave-1-jpg   NEW BUILD / Dynatorch Upgrade-slave-2-jpg   NEW BUILD / Dynatorch Upgrade-slave-3-jpg   NEW BUILD / Dynatorch Upgrade-slave-4-jpg  

    NEW BUILD / Dynatorch Upgrade-slave-5-jpg   NEW BUILD / Dynatorch Upgrade-slave-7-jpg   NEW BUILD / Dynatorch Upgrade-slave-6-jpg  
    Last edited by magma-joe; 09-06-2009 at 11:57 PM.


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    Magma-joe,

    Dude, I want to come play in your shop! That is pretty nice. You have been working on this for awhile I see. Just the drawings must have taken some time. I notice in the pic where you have the parts clamped in the mill that there is some (for lack of a better word) perforations on the parts, is that to hold them in while milling? If so how thick are they and do you have to build that into the CNC file? I can see where CNC is a bug! That looks like fun. I bet that has opened up a world of opportunities for you.

    Looking Good!

    WSS

    www.metaltechus.com


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    I am envious of your skills and patience, i would never even attempt to do what you are doing, looking forward to seeing it in action...

    EDD



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    Thanks WSS,
    The perforations you speak of are called tabs. They keep the part from dropping out when the end mill makes the last pass. It is a feature in the Vetric Vcarve cad cam software I use. The brackets are 1/4" thick.

    The shop and tool collection has been a work in progress for over 20 years. When I purchased the Dynatorch machine it was addictive and within a couple of years a CNC mill appeared. So watch out WSS, your Dynatorch will put a smile from ear to ear.

    Thanks Edwardo,
    Sometimes I wonder myself what the heck am I getting myself into?



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    magma-joe,
    How is the progress, this is like waiting for the next sequel of my favorite movie. I can't wait to see some pics! I hope all is well and you are too busy to get to it.

    My DT stuff was delivered today and I will probably have a chance to get to it this weekend.

    Look forward to your progress!

    WSS

    www.metaltechus.com


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