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Headstock Riser Block Set

SKU: 1291 Category:

Product Description

A 3.5″ (90 mm) diameter part is the largest part that can be accommodated in the standard Sherline lathe. Yet, occasionally it may be necessary to work on something larger. The Sherline headstock spacer block increases the maximum working diameter of the lathe to 6″ (152mm). This set includes a 1-1/4″ (32 mm) spacer block to fit under the lathe headstock and a riser-rocker tool post that raises the cutting tool by a corresponding amount. This useful accessory greatly expands the capability of the lathe.

If you wish to turn parts between centers with the headstock riser in place, you will also need to raise the tailstock the same amount with the tailstock riser block.

NOTE: While parts up to 6″ in diameter can be turned with the spacer block kit in place, it should be remembered that the horsepower of the lathe has not been increased a corresponding amount. Spacer blocks are intended for easy-to-machine materials, or for an occasional job requiring more clearance. If the work you intend to do is of a size that consistently requires spacer blocks, you might want to consider a larger lathe.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 1291 Instructions

Instructions PDF Download

Riser Rocker Tool Post
Tool Post Body Material Aluminum
Body Coating Black Anodized
Body Dimensions (H x W X D) 2.75″ x 1.25″ x 1.25″
Rocker Center Material Aluminum
Riser Block
Riser Block Body Material Aluminum
Body Coating Black Anodized
Body Dimensions (H x W X D) 1.25″ x 2.5″ x 3″
Pivot Pin Case Hardened 12L14 Steel
Alignment Key Material Precision Ground Steel
Part No. Description Quantity
12950 Headstock Riser Block 1
12980 1/4-20 x 3/8″ Flat Head Machine Screw, Slotted 1
12990 Riser Pivot Pin 1
40250 T-Nut 1
40260 Precision Ground Head Key 1
40330 10-32 x 5/8″ SHCS 2
40540 5/16-18 x 3/4″ Cone Point Set Screw 1
40660 #10 Washer 3/16 1
12850 Rocker Riser Tool Post Body 1
11990 Rocker Tool Post Rocker Center 1
12860 10-32 x 3/4″ SHC Screw 2


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