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Thread: Kim's - BTW 4x8 CNC Build

  1. #21
    Member beartooth's Avatar
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    Default Re: Kim's - BTW 4x8 CNC Build

    Quote Originally Posted by peteeng View Post
    Hi BT - They may be designed for setting or grouting a rail but floating it 1/4" above the steel? What is the epoxy spec can you link to supplier? Cheers Peter
    I not sure what the the rules are yet for adding product links, etc. But go to precisionepoxy dot com under product list under the "Leveling Epoxies" - SC-15P. I did a ton of research on this and there are numerous successful machine builds (not just routers) using this technic so I felt pretty good this would be a good solution. I wasn't able to use this exact product but a very, very similar product due to timing. Oh and this stuff is hard as a rock!



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    Default Re: Kim's - BTW 4x8 CNC Build

    One additional piece of information that I learned, many machine tool re-builders use this stuff as well.



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    Default Re: Kim's - BTW 4x8 CNC Build

    Yet more fabricating work for the fail safe stops, limit and homing proximity switch brackets. It's the little stuff that chews up time!

    Attached Thumbnails Attached Thumbnails Kim's - BTW 4x8 CNC Build-img_20191003_202807_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191003_202816_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191003_202824_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191003_202846_1-jpg  

    Kim's - BTW 4x8 CNC Build-img_20191003_202905_1-jpg  


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    Default Re: Kim's - BTW 4x8 CNC Build

    It may be a different epoxy mix,but a good number of boatbuilders over here use this stuff for shimming things like engine feet or deck crane bases. Chockfast Orange | UK Marine Resins (Incorporating EIP) .Obviously there are several similar products for supporting crane or train tracks.For my part,I would want to be sure they had fully cured before doing any work over them.



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    Default Re: Kim's - BTW 4x8 CNC Build

    Hi BT - So you did a tonne of research settled on a product then used something different? then didn't tell us what you used? Most epoxies in this application are medium weight pure epoxies. Nothing really special about them. Some have additives to improve hardness such as ceramic fillers (sand, quartz etc). The chockfast orange in its SDS does not mention fillers yet it mentions its self extinguishing. This means it has ATH added maybe (aluminium trihydride). But not much as it won't pour if a lot is added. 40 barcol is pretty much standard for laminating resins (epoxy, vinyl esters and polyesters) Precision Epoxy don't publish their TDS or SDS so can't comment on their epoxies but their pours are impressive. I've been looking at making surface plates using epoxy but have not been able to find out how accurate they are compared to granite or if they are poured and stilled scraped & polished. The trick with thick pours is to get the hardener right. Too active means too fast and the surface crawls as you get hot spots. Too inactive and the epoxy won't go off!! It looses too much heat to its surroundings so just sits there and goes mushy... Cheers Peter



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    Default Re: Kim's - BTW 4x8 CNC Build

    Wow! I’m not even pass the first page and I have to say nice work, this is a beautiful build so far! By the way your welds look awesome, professional?

    As for the epoxy leveling could you add details such as the brand? I’m pretty sure this threads will soon become a howto example.



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    Default Re: Kim's - BTW 4x8 CNC Build

    Quote Originally Posted by peteeng View Post
    Hi BT - So you did a tonne of research settled on a product then used something different? then didn't tell us what you used? Most epoxies in this application are medium weight pure epoxies. Nothing really special about them. Some have additives to improve hardness such as ceramic fillers (sand, quartz etc). The chockfast orange in its SDS does not mention fillers yet it mentions its self extinguishing. This means it has ATH added maybe (aluminium trihydride). But not much as it won't pour if a lot is added. 40 barcol is pretty much standard for laminating resins (epoxy, vinyl esters and polyesters) Precision Epoxy don't publish their TDS or SDS so can't comment on their epoxies but their pours are impressive. I've been looking at making surface plates using epoxy but have not been able to find out how accurate they are compared to granite or if they are poured and stilled scraped & polished. The trick with thick pours is to get the hardener right. Too active means too fast and the surface crawls as you get hot spots. Too inactive and the epoxy won't go off!! It looses too much heat to its surroundings so just sits there and goes mushy... Cheers Peter
    Pete, I wasn't trying to avoid not telling you what product I used at all. I in fact talked to to folks at Precision and as luck would have it for me, they where heading out to a big 4 week job at an automobile plant and would be 6+ weeks before I could even get their product, that's were the timing comes in for me, I just did not want to delay what would have amounted to 2 months or better of a delay.. I ask about using the "West Systems" epoxy and he gave me some pointers. Yes they have some very impressive pours and yep as you stated there's not to much special about epoxy per say, you can add fillers etc, but tends to hurt the viscosity as you noted. What I learned and as you indicated as well, it's really about the hardener you choose for the environment and how thick your pour is going to be.

    I used the West Systems 105 and the slowest hardener they have 209 (which by the by the 209 hardener is a little harder to come by). I poured this in the mid spring here and I would not have wanted anything faster for a hardener. I actually let it setup for 3 weeks but as the days went by I would cut a small section out of the cross sections just to see how it was curing. By the end, if I wanted to take a chisel and hammer (how I was doing it in the beginning) I could no longer get a clean piece off the metal cross bars and I had to use a 25 grit belt sander to get the remaining epoxy off the cross sections. Here's a link to the physical properties and safety data sheets: https://www.westsystem.com/products/...al-properties/

    Hope this helps.

    Kim



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    Default Re: Kim's - BTW 4x8 CNC Build

    Quote Originally Posted by wizard View Post
    Wow! I’m not even pass the first page and I have to say nice work, this is a beautiful build so far! By the way your welds look awesome, professional?

    As for the epoxy leveling could you add details such as the brand? I’m pretty sure this threads will soon become a howto example.
    Hi Wizard, Yep I put the product details above to Pete's inquiry. Thank you, but no, not a professional welder, but I will confess I learned how to what was called in the early days HeliArc welding (Same thing as what we call TIG today) when I was about 13-14 years old thanks to my Dad. At the time he was a Chief Petty Officer in the Navy and stationed on a submarine tender (A floating repair shop for submarines). Weekends were he had "weekend duty", I was allowed to go with him. I spent the better part of my time in the machine and welding shops on the ship. There they taught me how to HeliArc weld, cut and inspect your welds, the whole 9 yards. From there it has always grew on me and I have 3 welders now :faceplam:, but my early career was in fact a machinist.



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    Default Re: Kim's - BTW 4x8 CNC Build

    Now beginning to start the process of threading all oil lines, wiring and coolant lines, etc. In the beginning it looks like a mess but, I figured I may as well show you the messy parts as well as in the end it comes together. Note all the wiring and oil lines have some outer shielding to protect from sharper bends and where I thought vibration could cause a rubbing issue. Also there is very, very little external exposure of these as I have most of the oil lines and wiring running through the internals of the machine as you can see.

    Boy was I getting excited as I thought I was seeing light at the end of the tunnel... little did I know just how much work it was going to be to complete wiring job. My controller box is under the table which makes for tighter working quarters but I didn't want to take any more shop floor space

    Attached Thumbnails Attached Thumbnails Kim's - BTW 4x8 CNC Build-img_20191006_223926_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191006_223841_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191006_223820_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191006_223754_1-jpg  

    Kim's - BTW 4x8 CNC Build-img_20191006_223913_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191006_223934_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191006_223740_1-jpg  


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    Default Re: Kim's - BTW 4x8 CNC Build

    I want my controller box were all my high voltage mostly AC on one side of the box and separated by some kind of wall and all my lower DC voltage on the other side. I've read where others have had odd electrical noise issues and since I had been around CNC machines in my early years and knowing how the commercial manufactures try and do separation in the controller boxes, I would follow that principle. I laid out all my components on some plywood about the size I knew I could fit a box under the table. For this sheet metal box, I found a local shop and they cut and just did the bending for me and I did all the welding. So for the center panel, I made this a double wall so I didn't have to worry about screws and stuff poking through the other side interfering with something else. I save a lot of packing material as I find at some point in time I can recycle/re-purpose it. I had a nice piece of 3/4" thick Styrofoam sheet that I used as a spacer and insulator in between the 2 panels. Once I had everything laid out, I transferred that onto the panels and did all the drill and tapping and I used a lot of the "self" drilling sheet metal screws were I could.

    I built a PC motherboard bracket that held the mini-ITX motherboard, a 12v mini ATX power supply and an SSD drive for a complete computer in a nice small package to put into the low voltage side of the cabinet. If your interested in knowing what components these are I'll post that as well.

    Again, I failed to take pictures of the raw metal box I may not get the rest for a few days.

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    Kim's - BTW 4x8 CNC Build-img_20191013_191950_1-jpg   Kim's - BTW 4x8 CNC Build-img_20191020_184621_1-jpg  


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    Default Re: Kim's - BTW 4x8 CNC Build

    You did an awesome job dude! Love the machine, its incredible for being built from scratch.



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