Page 16 of 35 FirstFirst ... 6141516171826 ... LastLast
  1. #151
    The heat I tried with the hair dryer was not enough to affect the foam, I kept it moving, but the thing is in my case it did not help with the bubbles. Maybe heat with less force would work ? it's just that with the draught excluder method there is not much room to create a tidal swell in the epoxy,
    Last edited by EddyCurrent; 31-01-2014 at 11:27 PM.

  2. #152
    Hair dryer and heat gun are different beasts dryer will never get hot enough to melt the foam. Heat gun would if you hovered in one place too long I'd wager...


  3. #153
    It's a compromise with the foam of enough heat to expand the air bubbles to pop them and not too much heat to melt the foam :)


  4. #154
    Dragging the tooth pick worked for me and it physically moved the epoxy about thus aiding the self leveling process.

  5. #155
    You can't beat low tech...I can't wait to start playing with the epoxy next week!


  6. #156
    It's done !

    This is before showing the moat in place. Clive S recommended 10mm epoxy each side of the linear rail so with my rail being about 20mm wide the epoxy bed has to be 40mm wide. Because my support beam is 50x50x3 box section it only left 5mm spare each side which meant the draught excluded would have been on the radius of the box section, that's why I clamped strips of wood each side so as to fully support the draught excluder. You can see I've coated the joints and any gaps with sealer.

    Click image for larger version. 

Name:	epoxy5.JPG 
Views:	302 
Size:	130.5 KB 
ID:	11485Click image for larger version. 

Name:	epoxy6.jpg 
Views:	279 
Size:	117.5 KB 
ID:	11486

    The gear used and the environmental conditions at the start. I used an old ice cream tub and a sawn off milk carton, the epoxy was mixed in the milk carton then poured into the ice cream tub with a thin stream as suggested previously. I'm not sure this did much but at least there was no mess created. The ice cream tub had a 7mm hole on one side, right at the bottom, with a piece of tape across and this proved to be perfect for pouring. Humidity is quite low because I always have a dehumidifier in there.
    The calculated volume of my moat to give 5mm depth of epoxy was about 605300 mm^3 and it worked out that 500g of epoxy plus 250g of hardener was just right.

    Click image for larger version. 

Name:	epoxy7.JPG 
Views:	249 
Size:	119.9 KB 
ID:	11487Click image for larger version. 

Name:	epoxy8.jpg 
Views:	229 
Size:	118.3 KB 
ID:	11488

    This is after the pour, you can see the meniscus. There were no leaks and there was never any risk of it overflowing the moat. The epoxyducts were about 10mm wide and I'm thinking they could have been wider, definitely no smaller, the reason being that with this viscosity it needs a decent channel to flow down otherwise I would not be confident that the whole surfaces were at the same level.

    Click image for larger version. 

Name:	epoxy9.JPG 
Views:	283 
Size:	87.4 KB 
ID:	11489Click image for larger version. 

Name:	epoxy10.JPG 
Views:	303 
Size:	120.8 KB 
ID:	11490Click image for larger version. 

Name:	epoxy11.jpg 
Views:	300 
Size:	146.1 KB 
ID:	11491Click image for larger version. 

Name:	epoxy12.jpg 
Views:	262 
Size:	311.6 KB 
ID:	11492
    Last edited by EddyCurrent; 02-02-2014 at 05:47 PM.

  7. The Following 4 Users Say Thank You to EddyCurrent For This Useful Post:

  8. #157
    Eddy That looks nice re the moat I did find that my moat could have been a little wider although I did have two of them. I am sorry that I forgot to mention that before but you have plenty of width now in the centre even you don't get rid of the meniscus. ..Clive

  9. #158
    I think the meniscus extends about 5mm across the width so with that each side it leaves a 30mm flat section in the middle, as you say that will be plenty for rail mounting. A file will soon sort out the meniscus removal later.

    I forgot to mention that I had an epoxyduct at each end, plus, and it might be going extreme, I gave the epoxyduct pieces of wood a coating of sanding sealer thinking that the bare wood might soak up some of the epoxy, unlikely though it might be.

    Click image for larger version. 

Name:	epoxy14.JPG 
Views:	265 
Size:	173.4 KB 
ID:	11493

    Also in the excitement I forgot to put Vaseline on the sides of the draught excluder but not to worry it just means a bit of sandpapering later.
    Last edited by EddyCurrent; 02-02-2014 at 09:37 PM.

  10. #159
    Looking good Eddie, I've ordered the draught excluder so will be finishing off the frame to the point where I decide whether to paint it first or epoxy and then paint. I quite fancy getting it powder coated...


  11. #160
    I had those thoughts myself but decided to epoxy onto bare metal. I had put metal primer on the box section beam but before putting the moat on I sandpapered it off the top. My intention is to fit the linear rail and paint over everything up to that.
    Also sod's law, my glasses fell to bits as I was getting set to pour, the frame had broken letting a lense drop to the floor, had to quickly superglue it all back together.

    I know this is somewhat less than scientific but I just had a play with the sample epoxy pour I did 3 days ago, a scriber barely scratched the surface and a centre punch made no more of a mark in it than it did in the steel box section. Overall I'd say that stuff was rock hard.
    Last edited by EddyCurrent; 02-02-2014 at 06:26 PM.

  12. The Following User Says Thank You to EddyCurrent For This Useful Post:

Page 16 of 35 FirstFirst ... 6141516171826 ... LastLast

Similar Threads

  1. traveling steady, turning 1/2 bar down over 10".
    By graffian in forum Metalwork Discussion
    Replies: 3
    Last Post: 08-05-2013, 06:59 PM
  2. NEW MEMBER: Hello all, finally ready to start a build log.
    By Iwant1 in forum New Member Introductions
    Replies: 11
    Last Post: 25-12-2012, 05:03 PM
  3. eBay: Boxford 125 TCL Mach3 Ready
    By rnr107 in forum Items On eBay UK
    Replies: 1
    Last Post: 25-07-2012, 06:29 AM
  4. Anyone have experience of ready made machines
    By bogstandard in forum Milling Machines, Builds & Conversions
    Replies: 9
    Last Post: 07-04-2010, 06:44 PM
  5. Windows 7 RTM Confirmed & Ready !
    By Lee Roberts in forum Computer Software
    Replies: 8
    Last Post: 29-07-2009, 02:33 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts