13.03.2020  Author: admin   Workshop Bench Plans
Try again. Steamed wood compresses considerably but stretches little. Audible Download Audiobooks. The forms shown [ Drawing below ] are for the desk, shown in photo above. Sorry, there was a problem saving your cookie preferences. Previous page.

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Audible Download Audiobooks. DPReview Digital Photography. Shopbop Designer Fashion Brands. Holes or mortises distort or they cause the part to collapse or split; perform these operations after bending. Leave extra length at both ends for trimming. Where a bend is near the end of the part, extra length also provides the leverage needed to anchor the bend. Cut stock for parts requiring tight bends so the annual rings lay flatwise against the surface of the bending form [ Drawing delow ].

For mild bends, grain orientation is less important. Steaming takes about one hour per inch of workpiece thickness and parts must stay on the bending form for one hour, so unless you make more than one form, the steam box only has to accommodate one part at a time. For efficient use of the steam boiler [ Sources ], a steam box should be only large enough to hold the part blanks with room all around for good circulation.

For tight bends on thick parts, increase box size to accommodate resteaming a partially bent piece. The steam box shown in [ Drawing below ] holds two leg blanks for the desk shown above and accommodates resteaming of a partially bent leg. Make bending forms from particleboard or plywood laminated to a thickness equal to the width of the bending blank.

Bending a workpiece puts considerable stress on the form, so when in doubt, more form width beats less every time. Bent parts retain most of their shape after cooling but to minimize springback, must be held to a form until completely dry. The forms shown [ Drawing below ] are for the desk, shown in photo above. We made six drying forms to accommodate four leg blanks plus two extras. Securely clamp the bending form to a sturdy workbench. Have all clamps handy.

Bending should be accomplished within five minutes after removing the blank from the steam box so you may want to rehearse your procedure. Fire up the boiler. When steam steadily flows out of the drain hole, slide your blank into the steam box. Steam blanks for one hour per inch of thickness regardless of the width. Remove the part from the steam box and bend it [ Photos below ]. Working quickly, position the steamed blank between the anchor block and the end block on the tension strap assembly.

Clamp the blank to the bending form and bending arm, applying clamps both vertically and horizontally. Begin to bend the blank around the form.

Thick parts, such as the legs on the desk, require significant force so put your body into the bend or enlist a helper.

Thick parts, such as the legs on the desk, require significant forcea so put your body into the bend or enlist a helper. Thick parts may not bend in one operation. When you feel too much resistance, remove the part from the form and re-steam it for 15 minutes. As the bend nears completion, remove the bending arm clamps interfering with the bend. Then draw the free end against the form with a one-handed bar clamp.

Clamp the straight portion of the leg to the form and then add clamps along the curved section. Allow the part to cool for one hour and then quickly transfer it to a drying form. Clamp multiple thin strips at the bend to prevent surface splintering. Leave the part on the form for one week. Safety note! Steam scalds skin on contact. Opening the steam box releases a cloud of steam, so keep your face and any other bare skin away.

Wear heavy leather gloves when handling steamed blanks. Make sure the drain hole remains open. Do not pressurize the steam chamber: Pressurized steam is detrimental to successful wood bending and extremely dangerous.

Source: Boiler: Steam-bending kit no. Sources: Spring steel strip,. Tension-strap hardware for complex curves: S-bend unit no.

Lee Valley Hardware, , leevalley.

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