Official Luthiers Forum!

been busy since the shut down
wanted to do this a long time
Now I can spray a body with less running and fumes . Just ordered a Fuji semi pro 2 turbine hvlp to replace my old
hvlp set up
https://www.youtube.com/watch?v=escxSMDoC5g

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

Looks like a fine setup John.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.

Vy slick , an cool but when the guitar is done , does it have a rotisserie flavour ?

That looks great. Where did you get a motor that turns so slowly? I would like to buy one myself.

this is what I am using
https://www.amazon.com/Universal-Replac ... 59&sr=8-31

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

Very nice indeed.

Love this!!! Moving into a new house soon and I'll be using this idea for my booth. Thanks for sharing it John.

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Hutch

Get the heck off the couch and go build a guitar!!!!

Dude that’s awesome!!!!


Sent from my iPhone using Tapatalk

Thanks, John. The description in the link says it uses a 5/16" square rotisserie spit rod. Is that what you're using to hold the guitar? How did you mount the hardware that holds the guitar to the rod? Inquiring minds want to know.

I tossed the square rod took a 5/16 carriage bolt squared that and JB welded it into the rotisserie I have a hanger that screws into the neck block . THis is much more rigid than the square stock. I took square tube put a 1/4 20 thumb screw and welded a plate that screws in the neck block and can slip in and off

_________________
John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

That is an excellent setup!
One question, what do you use for the fan?

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Joe Beaver
Maker of Sawdust

I am using a 8 in duct fan with an induction motor. it moved 460 cfm and with induction no sparks. There is plenty of air exchange.
I was spraying and took of my mask and there was no odor till I turned off my fan. The air curtain design works well.

_________________
John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

That is such a clever design. Do you use it for Nitro?

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Joe Beaver
Maker of Sawdust

John, are you saying the duct fan motor is explosion proof?

yes I use this for nitro. Yes it is explosion proof as there are no sparks as there is in a brushed motor. Also there is a fresh air factor so the fumes cannot build up. You can literally spray nitro right into the fan . I even sprayed gasoline in it. it won't burn.
Induction motors don't use an electric contact so no spark no flame

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

It might be acceptable to call it intrinsically safe, but I wouldn't go to explosion proof. That would mean that it is built to actually contain an explosion.

lets say the fire risk is very low

_________________
John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

My thinking, being wrong is always an option tho, is that in motor classification explosion proof means that it can't cause or
contribute to spark ignition leading to an explosion. For example the motors at gas station pumps are no doubt classified as explosion proof. I have a couple of them on homebuilt tools and they are totally enclosed and sealed so that no vapors can enter.

All the explosion proof fans I see keep the fumes from any chance of getting near a spark I do not think they will hold back a real explosion. There are a few things you need to cause the explosion. It is not as easy as one may think as it takes fumes in proper concentration to air , a heat source before it can ignite . Most flare ups are minor but never let your guard down. Keep dust and fuel away.

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

There are several different explosion proof classifications, but the main ones actually mean that an explosion can occur inside the electrical enclosure and it is strong enough to not fly apart. It also largely keeps vapors out but a leaky gasket is not an uncommon occurrence. So the extra strong enclosures are there to keep it from becoming a bomb.

I used to design some electrical systems for gas stations and had to be very familiar with the requirements.

designed and made the VOC vent. Using a 4 in duct fan into a 4 in PVC pipe with 1/2 in holes spaced 4 in apart. It is 55 in long. 2 holes at the far end. Just got finished spraying a body and let the VOC vent run for 15 min. Fumes are at a minimum. I can smell a little of lacquer but it is very mild.
I will be playing a bit more with this but I do like the way it removes fumes and gases.
My shed is 12 by 20 . I open the room window 4 in . This gives me 96 sq in of air. this is about 1 1/3 more than the duct diameter. I also have a 4 in hole to vent in the booth. the key is to get outside fresh air to keep the concentration of fumes to a minimum. Will post more in the near future To all be safe hide like a moonshiner.

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

G** D*** Revenuers!!!

4" is very small for an exhaust. Most commercial units have up to a 16" diameter exhaust. My spray booth is necked down to 14" in order to go between my joists and rafters.

4 inches does the job this pulls the heavy gases off the floor lever I have 3 vents 8 in for the table 2 4 inchers one floor level the other about waist high. After spraying the 8 in turns off at 5 min the 2 4's keep pulling fumes. Works well it is all about pressure control and air flow. 14 can pull all the ambient air out of a building and you loose rh and temp control.
With this design this allows the fumes to be controlled and vented at a rate that allows me control of the rooms temp and rh while dispersing gases

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

John, sounds good. The difference for me is that I do not have a small spray room like yours. Wish I did. My booth is open to the shop so I have to move a lot of air to clear the shop of any overspray that is not initially collected by the booth.