Eclipse projection board...27deg

[bugbear]

<table>
<tr><td><td><td>2<td>2.4<td>2.8<td>3.1<td>3.6<td>4.8</tr>
<tr><td>20<td>0.34906585<td>68.4<td>69.5<td>70.6<td>71.4<td>72.8<td>76.1</tr>
<tr><td>22.5<td>0.392699082<td>58.1<td>59.1<td>60.1<td>60.8<td>62.0<td>64.9</tr>
<tr><td>20<td>0.34906585<td>68.4<td>69.5<td>70.6<td>71.4<td>72.8<td>76.1</tr>
<tr><td>22.5<td>0.392699082<td>58.1<td>59.1<td>60.1<td>60.8<td>62.0<td>64.9</tr>
<tr><td>25<td>0.436332313<td>49.9<td>50.7<td>51.6<td>52.2<td>53.3<td>55.9</tr>
<tr><td>27.5<td>0.479965544<td>43.0<td>43.8<td>44.6<td>45.1<td>46.1<td>48.4</tr>
<tr><td>30<td>0.523598776<td>37.3<td>38.0<td>38.7<td>39.2<td>40.1<td>42.2</tr>
<tr><td>32.5<td>0.567232007<td>32.4<td>33.0<td>33.7<td>34.1<td>34.9<td>36.8</tr>
<tr><td>35<td>0.610865238<td>28.2<td>28.8<td>29.3<td>29.8<td>30.5<td>32.2</tr>
<tr><td>37.5<td>0.654498469<td>24.5<td>25.0<td>25.5<td>25.9<td>26.6<td>28.1</tr>
<tr><td>40<td>0.698131701<td>21.2<td>21.7<td>22.2<td>22.5<td>23.1<td>24.5</tr>
<tr><td>42.5<td>0.741764932<td>18.3<td>18.7<td>19.1<td>19.5<td>20.0<td>21.3</tr>
<tr><td>45<td>0.785398163<td>15.6<td>16.0<td>16.4<td>16.7<td>17.2<td>18.4</tr>
<tr><td>47.5<td>0.829031395<td>13.2<td>13.6<td>14.0<td>14.3<td>14.7<td>15.8</tr>
<tr><td>50<td>0.872664626<td>11.1<td>11.4<td>11.7<td>12.0<td>12.4<td>13.4</tr>
<tr><td>38<td>0.663225116<td>23.8<td>24.3<td>24.8<td>25.2<td>25.8<td>27.4</tr>
</table>

I think that convincingly demonstrates that blade thickness is no big deal.

For example, to go from 22.5 to 25 degrees with a 2.4 mm blade, the extension changes from 59.1 to 50.7, a change of 8.4mm.

But if, (at 22.5 degrees) we massively upgrade our blade from 2.4 to 3.1, the projection only changes from 59.1 to 60.8, a change of 1.7mm.

So (thinking backwards) changing the blade thickness for a constant projection does alter the angle, but not by enough (for me) to worry about.

BugBear

 

[wizer]

 

[Paul Chapman]

:lol:

 

[Derek Cohen (Perth Oz)]

"Woodbloke-style wooden setting block"?! ... Paul, this method has been around for yonks (e.g. BB has posted a pic of his jig a good many times as the occasion warranted it). It is interesting that we have a tendency to name a jig after the last person who uses it.

Rob, I do like your tutorial here. My comment above should in no way be construed as a criticism, just a comment.

In fact I like it better than an alternate method I have, which I will add to the pile.

Regards from Perth

Derek

 

[bugbear]

"Woodbloke-style wooden setting block"?! ... Paul, this method has been around for yonks (e.g. BB has posted a pic of his jig a good many times as the occasion warranted it). It is interesting that we have a tendency to name a jig after the last person who uses it.

Rob, I do like your tutorial here. My comment above should in no way be construed as a criticism, just a comment.

In fact I like it better than an alternate method I have, which I will add to the pile.

(chuckle) Hmm. That method requires a fancy gadget AND a horizontal bench!

BugBear

 

[bugbear]

On the assumption that was intended as an insult, consider me duly offended.

BugBear

 

[thejhw]

"Woodbloke-style wooden setting block"?! ... Paul, this method has been around for yonks (e.g. BB has posted a pic of his jig a good many times as the occasion warranted it). It is interesting that we have a tendency to name a jig after the last person who uses it.

Rob, I do like your tutorial here. My comment above should in no way be construed as a criticism, just a comment.

In fact I like it better than an alternate method I have, which I will add to the pile.

(chuckle) Hmm. That method requires a fancy gadget AND a horizontal bench!

BugBear

If the bench isn't horizontal, don't you just zero the gauge?

Jim

 

[Derek Willis.]

I just love the guage, never seen one,and would love to own one.
Derek.

 

[woodbloke]

Rob, I do like your tutorial here. My comment above should in no way be construed as a criticism, just a comment.

In fact I like it better than an alternate method I have, which I will add to the pile.


Regards from Perth

Derek

Derek - I came up with this method when I was trying to work out a simple way of setting the angle that didn't involve complex maths, calculus and fundamentals of trig...just a quick and easy practical way of setting any angle using bench tools that anyone ought to have in a 'shop - Rob

 

[wizer]

no need to be offended BB it's only a bit of fun.

I'm off to try the Derek Cohen Angle Method

 

[Peter T]

I just love the guage, never seen one,and would love to own one.
Derek.

Just found them at http://www.rockler.com for $29.99 plus shipping.

 

[Woody Alan]

Just found them at www.rockler.com for $29.99 plus shipping.

here is an alternative source in the UK.
I'm not sure rockler are cheap on shipping to UK, if you want to order from states ordering from Wixey direct might be best.

Alan

 

[Peter T]

Just found them at www.rockler.com for $29.99 plus shipping.

here is an alternative source in the UK.
I'm not sure rockler are cheap on shipping to UK, if you want to order from states ordering from Wixey direct might be best.

Alan

Tried to do that but they want payment via PayPal, and they won't accept payment from a non-USA PayPal account!!

I'm lucky in that I get stuff delivered to my US office and then pick it up next time I'm there.

 

[gidon]

You could try that ebay company's website:
https://www.machine-dro.co.uk
Cheers
Gidon

 

[PaulO]

I'm off to try the Derek Cohen Angle Method

By Derek's own theory that method is now the "Wizer Angle Method"

 

[Peter T]

You could try that ebay company's website:
https://www.machine-dro.co.uk
Cheers
Gidon

Even at today's poor exchange rate, they are charging approx. $44.

I got one for $29.99, a 47% saving.

Thanks anyway,