Workshop extractor

Intake side. Made from aluminium.
knoba - Workshop extractor

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Exhaust side. Enclosure made from 304 stainless steel, plywood & galv weldmesh.
knoba - Workshop extractor

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240v Torin Sifan extractor, centrifugal fan. Fabricated wall interface.
knoba - Workshop extractor

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3 developments. Mallet formed. Pop riveted & silicon seams. Cad file below.
knoba - Workshop extractor

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Removable grill made from plywood & weldmesh.
knoba - Workshop extractor

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Hardwood former (1st) used for hammer forming intake cowling
knoba - Workshop extractor

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Hardwood former (2nd) used for hammer forming intake cowling
knoba - Workshop extractor

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Hardwood former (3rd) used for hammer forming intake cowling
knoba - Workshop extractor

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First phase complete. To do: trim edges & fold over returns…
knoba - Workshop extractor

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Softwood former (4th) used for hammer forming edges of intake cowling
knoba - Workshop extractor

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Needed to make a tucking fork for this operation
knoba - Workshop extractor

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Front side.
knoba - Workshop extractor

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Back side.
knoba - Workshop extractor

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Power. Extractor is quiet & very powerful.
knoba - Workshop extractor

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Materials:
(FAN)
1 x Extractor fan
1 x Wall interface plate (1.5mm galvanised sheet)
1/8" pop rivets
Rawlplugs
6 x 12x2" stainless steel self tapers
6 x m8 stainless steel washers

(ENCLOSURE)
1 x 4'x4'x1.0mm 304 stainless steel sheet
1/8" pop rivets
Silicone sealant
1/2" closed cell foam sound insulation
High temp spray glue
10mm mild steel bar
2 x m6 stainless steel button cap bolts
2 x m6 stainless steel washers
Plywood
Weldmesh

(INTAKE)
2.0mm 6 series aluminium sheet
Grab adhesive

(ELECTRICAL)
240v metal clad switched outlet with light (5Amp fuse)
Metal clad surface mount backbox
22mm (7/8") through hole rubber grommets
1.0mm twin & earth cable
Rawl plugs
Screws
Earth sleeving
Trunking
Cable ties

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Torin-sifan – Ddn200-180a Extractor

Sassda – Stainless Steel

Rivetwise – Pop (blind) rivets

MK Electric – Commercial / domestic

Thor – Hammers & mallets

knoba – workshop extractor – 2017.dxf

knoba – Metalwork mallets

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http://www.homemadetools.net

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Woodwork awl

Recycled from a well-worn & much favoured Stanley philips 201 screwdriver. Re-ground & oil stone honed with 4 sided point
knoba - woodwork awl

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Awesome as a point awl (marking accurate; screw / drill points with brad point bits, flat bits & forstners)
knoba - woodwork awl

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Stanley – hand tools

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Coil winder stick

Made from mahogany, for loading with magnet wire, 500mm long
knoba - coil winder stick

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A 2a variac core in for rewinding
knoba - coil winder stick

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Materials:
1 x 524x25x6 mm (20 5/8"x1"x1/4") hardwood
note: use (feet, 1/2 yard) if imperial measurements preferred!

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Wired edge dollies

Thanks to billsmetal – youtube. Cut & pickled materials…
knoba - wired edge dollies

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How they will fit together
knoba - wired edge dollies

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Bevelled one edge for easier weld penetration
knoba - wired edge dollies

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Strong, flat heatsink (bench) & clamps to restrict distortion
knoba - wired edge dollies

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Gouged the rear of seam & welded to give homogeneous fusion
knoba - wired edge dollies

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Cleaned up with flap wheel & belt sander.
knoba - wired edge dollies

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Materials:
1 x 20x32x50mm mild steel, Rectangular solid section
1 x 25x38x50mm mild steel, Rectangular solid section
2 x 25x3x50mm mild steel, Flat section
2 x 50x6x50mm mild steel, Flat section

Normalise & harder alloy for upgrades.

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Smaller one here; base is 1/16″ (1.6mm) thick.
knoba - wired edge dollies

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YouTube – Billsmetal

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Magnetic Bunsen burner

Lovely old thing from ebay.
knoba - magnetic bunsen burner

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knoba - magnetic bunsen burner

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Painted with Finnagans Hammerite.
knoba - magnetic bunsen burner

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Old speaker magnet in the centre, steel band on the perimeter slightly taller than the magnet. Both stuck with silicon sealant.
knoba - magnetic bunsen burner

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In action stuck to the bench. No way that’s getting knocked off.
knoba - magnetic bunsen burner

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More helpful with some unusual annealing jobs.
knoba - magnetic bunsen burner

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240v Quick connect

Quick way to hook up stuff to test like; neon bulbs, DUT, etc.
knoba - 240v quick connect

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Standard mains 3 pin plug (UK).
knoba - 240v quick connect

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Access for fuse. Neon bulb, there. Wire gripers are epoxied on.
knoba - 240v quick connect

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Indicator light when unit is live. Entirely from recycle.
knoba - 240v quick connect

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Rivet sets & snaps

No go with any tool suppliers so got this chisel set off ebay…
knoba - Rivet snaps & sets

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Annealed.
knoba - Rivet snaps & sets

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Figuring out what I want and what can get away with. A set of Starrett radius gauges helped me figure out the radii for the tool grinding.
knoba - Rivet snaps & sets

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Machined, stamped, hardened & tempered (to suit: 3/32″, 1/8″ & 5/32″ diameter shank rivets)
knoba - Rivet snaps & sets

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Tried the “heat and hammer a ball bearing in” method, it just made a mess.
knoba - Rivet snaps & sets

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Anvil end. 2 snaps (one used as a hold-up) & a set for each size.
knoba - Rivet snaps & sets

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Jay Cee – Solid Round Head Rivet Specifications

Rivetking.com – Solid Rivet Design Considerations.pdf

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