0B15

[pee wee]

Hi Alan, I don't have the OB15 plans, but JM normally designates a base line to measure up and down from when cutting out the parts, and that is what should be in a line, not the tops or bottoms of the molds. Take a look at the plans and see if you don't identify it.

[AlanOB15]

Thanks I do see a line (BL) that must be the base line. Is it ok to publish a screen shot of the jig plan do you know?

[jacquesmm]

The baseline is the base for your alignments.
See this:


Complete explanations here:
http://bateau2.com/howto/jig.php

If that is not clear, post the question.

[AlanOB15]

So I see a baseline and I'm assuming in this case that is from the strong-back level and I see a measurement of 748mm from the baseline to the top of the trasnsom plus molds 3 & 4 and that measurement is longer than the height of those molds so I need to raise them I guess so that the top is 748mm from the baseline. What I do not see is a height for the bow or molds plus 1 & 2. I can see that the bow mold sits on the base line but the vertical height of molds 1 & 2 are a mystery to me right now.

I have read what you sent on and thanks but I just don't see that on the plans and maybe Im reading it wrong because every time I look I see more info I did not see before.

Alan

[jacquesmm]

You put the baseline at the level you want but for a 1st boat, keep it simple and use the dimensions I show.

Follow the tutorial that I linked to in the previous post:
- set up strongbacks
- cut your molds as shown on the plans
- put your molds on the strongbacks
- line them up vertically using the top of the strongbacks as the baseline.

If that is not clear, please read the tutorial. The OB15 does not use stringers but the set up of the molds is always done the same way, stringers or not.

If you want, we can set up a first mold, for example mold #3.

Let's work on one mold only and use this check list:
- are you strong backs level and set up like on the OB15 plans?
- is mold # 3 cut and CL marked?
- did your mark the longitudinal location of mold # 3 on the strongbacks
- do you have short 2x4 pieces cut and ready to raise the mold to the correct level?
If yes to all the above:
- clamp your 2x4 braces to the marked location
- clamp mold # 3 to the 2x4's
- adjust the level to match the level of the baseline that I show on the plans.

That's all there is to it. It is almost faster to do it than to try to describe but please, look through our gallery, there are many pictures of that method.

Here isa good web page about setting up the strongbacks:
http://bateau2.com/howto/foam3.php

Here is a picture of a mold on the strongbacks:


another one:


You don't have the stringers in the OB15 but same method for the molds.

[AlanOB15]

Note to self> Look harder at the plans. I found the BL on the actual mold measurements. Thanks for the help but unfortunately it may not be the last

Alan

[pee wee]

Note to self> Look harder at the plans. I found the BL on the actual mold measurements. Thanks for the help but unfortunately it may not be the last

Alan

It's not easy to describe in a two dimensional plan all the dimensions of a shape like a boat with all its details, so the specifics get spread across several pages. You'll find yourself needing to flip back and forth between pages to get the whole picture, and it's common for a first time builder to miss things and think critical information got left out. Usually a careful reexamination of the plans will provide the answer.

[jacquesmm]

It will be muhc easier on the second boat

[AlanOB15]

Again,, thanks guys for all the help!

Alan

[danieloldhouse]

It will be muhc easier on the second boat

Usually perfection is reached on the third