Author Topic: Parf Guide System Review  (Read 5659 times)

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Offline DiscoStu

  • Posts: 137
Re: Parf Guide System Review
« Reply #30 on: March 15, 2017, 03:53 AM »
Love it, much tidier than mine. I've been waiting to visit Halfords to get some metallic orange so very much on the same page.


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Offline Peter Parfitt

  • Magazine/Blog Author
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  • Posts: 3405
    • New Brit Workshop on YouTube
Re: Parf Guide System Review
« Reply #31 on: March 15, 2017, 06:18 AM »
@Z48LT1
As requested - photo of underside

The only question for @squarecut is...

Does the dust extraction work well enough as it is split between both holes at the same time - so, presumably, that is half the suck ?

Peter

Offline DiscoStu

  • Posts: 137
Re: Parf Guide System Review
« Reply #32 on: March 15, 2017, 04:15 PM »
I guess there is always a solution to that in the form of a thing called a parf dog! :-)


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Offline squarecut

  • Posts: 116
  • It Is What It Is
Re: Parf Guide System Review
« Reply #33 on: March 15, 2017, 05:09 PM »
@Peter Parfitt
Your observation about possible 50% loss of suction via the second chamber orifices being open led me to perform a test both ways.
With both chambers open there was a slight loss of suction, however drill shavings were completely removed from the work surface.
With the unused chamber sealed off with tape a stronger pull of air could be felt at the infeed air opening. Obviously, this was not a scientific test with instrumentation. To err on the safe side & eliminate the possibility of unremoved debris fouling the 20 mm boring bit, I decided to augment my DES (Dust Extraction Shoe) with a 90 degree closure segment affixed with rare earth magnets.
Many thanks for your alerting me to the possibility of reduced suction. With your single chamber device, it precluded the loss of suction issue. You obviously had that in mind when designing your unit. See attached photos.
« Last Edit: March 16, 2017, 12:07 AM by squarecut »
Largest private sawdust producer in Huntington NY

Offline Peter Parfitt

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  • Posts: 3405
    • New Brit Workshop on YouTube
Re: Parf Guide System Review
« Reply #34 on: March 16, 2017, 12:20 AM »
@Peter Parfitt
Your observation about possible 50% loss of suction via the second chamber orifices being open led me to perform a test both ways.
With both chambers open there was a slight loss of suction, however drill shavings were completely removed from the work surface.
With the unused chamber sealed off with tape a stronger pull of air could be felt at the infeed air opening. Obviously, this was not a scientific test with instrumentation. To err on the safe side & eliminate the possibility of unremoved debris fouling the 20 mm boring bit, I decided to augment my DES (Dust Extraction Shoe) with a 90 degree closure segment affixed with rare earth magnets.
Many thanks for your alerting me to the possibility of reduced suction. With your single chamber device, it precluded the loss of suction issue. You obviously had that in mind when designing your unit. See attached photos.

Well done.

If you look carefully at the start of my video for the dust port you will see a clear piece of Perspex which I bent to almost exactly the shape of the top of your dust port. It was part of one of my early efforts and was going to be mentioned but it had to be removed to cut the length of the video down. That design had two places for the hose to be connected and would have had a central divider inside so that the whole of the vacuum was applied to the particular port needed.

I had to do a double bend in the Perspex in order to get the height to allow the sloping face to be long enough to have the 35 mm holes in it for the hose end. I decided it was too difficult for people to make as it needed a hot air gun and some forming tools.

I like your finished design.

Peter