Some details of my AA Tyson restoration (a work in progress....)
The saw is driven by a McColl Electrical Works 1hp, 3 phase, 1430 rpm motor fitted with a 3-1/2" x 2A pulley with two A61 belts driving the 10" x 2A drive pulley, resulting in a band speed of 2620 feet per minute. The motor is originally mounted on a pivoting bracket at the rear of the saw. I still need to restore the motor, and I'll probably alter it's mounting arrangement.
IMG_1647.jpgIMG_1649.jpg
The original drive shaft had been badly damaged, and the locking grub screws had progressively mangled the shaft. I made a replacement shaft and fitted it to the lower housing with new bearings with rubbing seals - the originals being open caged items. The band wheel shafts run in 6305 2RS ball bearings in cast iron housings. The bearing closest to the drive pulley is covered by a sheet metal disc, but on the band wheel side, there is no such cover, so I used sealed bearings throughout.
IMG_1613.JPG
The 20" diameter x 1-1/2" wide band wheels are cast aluminium with bonded rubber tyres. They are located on their shafts with a single locking screw. The band wheels can be adjusted between 33-1/4" and 38" centers. An 11' (or 132") band results in 36" centers. I've yet to crown and balance the wheels. Overall height to the top band wheel at its maximum position is 69".
IMG_1642.jpgIMG_1646.jpg
The table is 16-3/4" sq. and stands 34" high, and appears to be made of either cast steel or white (nodular) cast iron...definitely not grey cast iron like the remainder of the machine. The number 5031 (perhaps a serial number?) is stamped into the top of the table above the drive pulley. The underside of the table is stamped with a number 6 which also appears on the end of the upper band wheel shaft. The table is mounted to the cast iron frame with a simple trunion by a single bolt. I machined a stepped washer to ensure the trunion bracket remains centrally pivoted on the mounting bolt. I still need to cast a new babbit or lead throat piece in the table.
IMG_1651.jpgIMG_1648.jpg
The upper band guide assembly (which I believe to be original) is 2 piece cast bronze (Wright pattern), and the jaws are unhardened wrought steel (easily filed). I need to make some hardened replacement jaws as they are badly worn and scored through poor adjustment. Two round head screws on top of the casting affix the upper sheet metal blade guard. Many of the threaded holes in the casting have had threads stripped and subsequently "upsized", so there's more work to do here. I'll fill them with silver soldered bronze plugs and restore them to their former Whitworth and BA sizes.
IMG_1639.jpgIMG_1640.jpgIMG_1641.jpgIMG_1642.jpgIMG_1654.jpg
The guide rise and fall is achieved via a hex steel bar in a poured babbit or lead shell. The babbit is retained in the upper arm of the main frame in a simple clamshell arrangement held with two bolts, and was poured in situ. Locking of the guide rise and fall is achieved with an aluminuim hand wheel with steel threaded stud acting directly against the hex steel shaft. The maximum clearance under the guides is 9-1/4".
IMG_1642.jpg
The lower guide is a simple bronze casting drilled for two static guides. I'm just going to use oiled dowel for the lower guides as there is very little scope for their adjustment. Timber lower guides (of various styles) were common place in many older bandsaws.
IMG_1645.jpg
I have removed what I believe to be the original sheet metal guarding (in its original pale green) from the saw. It's damaged and has suffered many repairs in its former life. The metalwork is spotwelded and painted galvanised sheet, secured by brackets and in some places screwed directly to the frame of the saw. The duct in the lower guard is obviously a later modification.
IMG_1633.jpgIMG_1635.jpgIMG_1636.jpgIMG_1637.jpgIMG_1638.jpgIMG_1634.jpg
The saw is driven by a McColl Electrical Works 1hp, 3 phase, 1430 rpm motor fitted with a 3-1/2" x 2A pulley with two A61 belts driving the 10" x 2A drive pulley, resulting in a band speed of 2620 feet per minute. The motor is originally mounted on a pivoting bracket at the rear of the saw. I still need to restore the motor, and I'll probably alter it's mounting arrangement.
IMG_1647.jpgIMG_1649.jpg
The original drive shaft had been badly damaged, and the locking grub screws had progressively mangled the shaft. I made a replacement shaft and fitted it to the lower housing with new bearings with rubbing seals - the originals being open caged items. The band wheel shafts run in 6305 2RS ball bearings in cast iron housings. The bearing closest to the drive pulley is covered by a sheet metal disc, but on the band wheel side, there is no such cover, so I used sealed bearings throughout.
IMG_1613.JPG
The 20" diameter x 1-1/2" wide band wheels are cast aluminium with bonded rubber tyres. They are located on their shafts with a single locking screw. The band wheels can be adjusted between 33-1/4" and 38" centers. An 11' (or 132") band results in 36" centers. I've yet to crown and balance the wheels. Overall height to the top band wheel at its maximum position is 69".
IMG_1642.jpgIMG_1646.jpg
The table is 16-3/4" sq. and stands 34" high, and appears to be made of either cast steel or white (nodular) cast iron...definitely not grey cast iron like the remainder of the machine. The number 5031 (perhaps a serial number?) is stamped into the top of the table above the drive pulley. The underside of the table is stamped with a number 6 which also appears on the end of the upper band wheel shaft. The table is mounted to the cast iron frame with a simple trunion by a single bolt. I machined a stepped washer to ensure the trunion bracket remains centrally pivoted on the mounting bolt. I still need to cast a new babbit or lead throat piece in the table.
IMG_1651.jpgIMG_1648.jpg
The upper band guide assembly (which I believe to be original) is 2 piece cast bronze (Wright pattern), and the jaws are unhardened wrought steel (easily filed). I need to make some hardened replacement jaws as they are badly worn and scored through poor adjustment. Two round head screws on top of the casting affix the upper sheet metal blade guard. Many of the threaded holes in the casting have had threads stripped and subsequently "upsized", so there's more work to do here. I'll fill them with silver soldered bronze plugs and restore them to their former Whitworth and BA sizes.
IMG_1639.jpgIMG_1640.jpgIMG_1641.jpgIMG_1642.jpgIMG_1654.jpg
The guide rise and fall is achieved via a hex steel bar in a poured babbit or lead shell. The babbit is retained in the upper arm of the main frame in a simple clamshell arrangement held with two bolts, and was poured in situ. Locking of the guide rise and fall is achieved with an aluminuim hand wheel with steel threaded stud acting directly against the hex steel shaft. The maximum clearance under the guides is 9-1/4".
IMG_1642.jpg
The lower guide is a simple bronze casting drilled for two static guides. I'm just going to use oiled dowel for the lower guides as there is very little scope for their adjustment. Timber lower guides (of various styles) were common place in many older bandsaws.
IMG_1645.jpg
I have removed what I believe to be the original sheet metal guarding (in its original pale green) from the saw. It's damaged and has suffered many repairs in its former life. The metalwork is spotwelded and painted galvanised sheet, secured by brackets and in some places screwed directly to the frame of the saw. The duct in the lower guard is obviously a later modification.
IMG_1633.jpgIMG_1635.jpgIMG_1636.jpgIMG_1637.jpgIMG_1638.jpgIMG_1634.jpg
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