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| PAWN |
 Posted: Mon Aug 31, 2009 8:02 am |
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Joined: 06 Jul 2005
Posts: 4175
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Something I've often wondered, especially now I won a home with a yard and want to build a ramp soon (my fiance wants me to build one so my stepdaughter can use it as well.)
So I plan to build a mini, 4' high. Since ply sheets are 8'x4' how should I go about cutting the transitions? Do most of you use more than one sheet just so you can have some extra ply at the bottom? |
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| hank1113 |
| Posted: Mon Aug 31, 2009 8:08 am |
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Joined: 30 Apr 2009
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Location: Richmond Va
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| every ramp I built that was 4 foot high I used one 4x8 sheet for each transition... I only left room for a 2x4 at the bottom... The mini I am building now is 6 foot high and we used 2x10's on the flat so I used two 4x8 plys to get the transition we wanted... We made this one beefier since its off the ground on one end to make it level... I wouldnt think it really makes much difference how you do it... |
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| PAWN |
| Posted: Mon Aug 31, 2009 8:23 am |
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?? I guess what I'm not understanding, is that the 4 height isn't really 4 ft then? I mean, since the sheet is 4' wide, then you'd have to leave a lip at the bottom, thus reducing the height of the ramp really. Did you cut the transition down to a point like as attached:
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| mkelty |
| Posted: Mon Aug 31, 2009 12:53 pm |
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Joined: 06 Oct 2006
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Location: Springfield, OR
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If you build a frame under the whole thing, you could do A, and you need to plan for 2 crossmembers of the frame underneath the end of the transition template to support the transition from flat to curve.
If you plan to *INTEGRATE* the flat into the sides of the transition template, then you'd do B.
B is definitely more commonly used. Also, there is a trick to getting the whole template out of one sheet, you use the B approach, but then finish your height with the uncut portion of the template.
Imagine two triangles, the first is B. Then, you take the leftover piece, flip it horizontally, rotate it counter clockwise by 90 degrees, and finish the transition.
Without drawing it out, imagine the finished template has a rectangular gap at the left bottom corner of B, and your final scrap is an egg shape (having had the tranition cut from both sides)
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| PAWN |
| Posted: Mon Aug 31, 2009 1:14 pm |
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| i understand that two can be cut from one sheet. I guess it was the height thing that is only the confusing part....i'd rather not end at a point, as seen in example A, simply because that could lead to a little bump/ditch at the bottom of the transition. I suppose I will take two sheet and make a square, then draw out the transition and cut it out, and use the remainder for decking. |
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| hank1113 |
| Posted: Mon Aug 31, 2009 1:17 pm |
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Location: Richmond Va
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PAWN wrote: ?? I guess what I'm not understanding, is that the 4 height isn't really 4 ft then? I mean, since the sheet is 4' wide, then you'd have to leave a lip at the bottom, thus reducing the height of the ramp really. Did you cut the transition down to a point like as attached:
The last 4 footer I built I did like B with 3 inch coping so I wasnt really that concerned with the ramp actually being "4 foot". The 6 footer I am building will be 6 and some change from the flat to the coping. I wouldnt go through the trouble of cutting 3 inches out of another piece of plywood in order to truly get 4 feet. |
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| blueballs |
| Posted: Sun Sep 06, 2009 2:41 pm |
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Joined: 02 Jun 2009
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PAWN wrote: i understand that two can be cut from one sheet. I guess it was the height thing that is only the confusing part....i'd rather not end at a point, as seen in example A, simply because that could lead to a little bump/ditch at the bottom of the transition. I suppose I will take two sheet and make a square, then draw out the transition and cut it out, and use the remainder for decking.
height really doesn't come into play- when you're dealing w/ 4ft and under- would nottice the difrfence between 3' 8" or 3' 11" , no- what you're going to notice is the transition- if you cut it below 4ft you need to use smaller then 7ft transitions=which are mellow- and when you move into the 5 ft area they are super tight- that's what you will notice- |
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