Z-Axis Power Lift vs Fine Feed Spacer: Which to Buy First?

By Products for bench top machinists | LittleMachineShop.com | Published: 2026-10-16

Category: Buying Guides

A practical buying guide to help bench mill owners choose between a Z-axis power lift bench mill upgrade and a low-cost z-axis fine feed spacer.

Quick Answer

If you own a HiTorque deluxe large bench mill or a SIEG SX3.5 with a power lift on the Z-axis drive and you are tired of cranking the head up and down, buy the Z-Axis Power Lift Motor first. If you run a micro mill and your fine feed feels loose or the assembly is missing its spacer, buy the Z-Axis Fine Feed Spacer first because it is a low-cost replacement part. The two parts serve different machines and different problems, so check your mill model before ordering.

Match the Part to Your Mill Before You Compare

These two Z-axis parts are not interchangeable upgrades for the same machine. The Z-Axis Power Lift Motor is built for the HiTorque deluxe large bench mill and SIEG SX3.5 large bench mills that already have a power lift on the Z-axis drive. The Z-Axis Fine Feed Spacer is a replacement spacer for the Z-axis fine feed assembly on the micro mill. If you own a micro mill, the power lift motor is not the right first purchase. If you own a large bench mill with a power lift, the fine feed spacer is not a performance upgrade for your machine.

When the Power Lift Motor Is the Smarter First Buy

The power lift motor makes sense when the machine already supports it and the job involves frequent head height changes. On a large bench mill, raising and lowering the head by hand between drilling, milling, and setup checks gets old fast. The motor is a direct fit for the HiTorque deluxe large bench mill and SIEG SX3.5 large bench mills with a power lift on the Z-axis drive, so you are not adapting a generic part. The trade-off is cost and installation time. At a catalog price of USD 145.67, it is a bigger commitment than a spacer, and you need to confirm your mill has the power lift drive before ordering.

When the Fine Feed Spacer Is the Smarter First Buy

The fine feed spacer is a repair and maintenance part, not a power upgrade. It fits the Z-axis fine feed assembly on the micro mill and is a metal spacer measuring 28 mm outer diameter, 10 mm inner diameter, and 5 mm long. If your micro mill fine feed is missing this spacer, the assembly may not work correctly, and replacing it is a low-cost fix at USD 2.37. The trade-off is that it does nothing for head lift effort on a large bench mill. Buy it when you are restoring or servicing a micro mill, not when you want faster Z-axis movement.

Mini Mill Head Lift Upgrade: What Else to Consider

A mini mill head lift upgrade is usually about reducing effort and improving control, but the right path depends on the machine. If you are working on a micro mill, start with the fine feed assembly and make sure the spacer and related parts are present and correct. If you are working on a large bench mill with a power lift drive, the power lift motor is the direct upgrade. Do not assume a bench mill Z-axis kit will fit every mill. The catalog facts for these two parts point to different machine families, so verify your model and existing hardware before buying.

Decision Rules for Your Z-Axis Upgrade

Rule 1: Identify your mill model first: The power lift motor fits HiTorque deluxe large bench mills and SIEG SX3.5 large bench mills with a power lift on the Z-axis drive. The fine feed spacer fits the micro mill Z-axis fine feed assembly. If your mill is not one of those models, neither part is the right first buy.
Rule 2: Buy for the problem you actually have: If you are tired of manual head cranking on a compatible large bench mill, choose the power lift motor. If your micro mill fine feed is missing or worn and needs a spacer, choose the fine feed spacer. Do not buy a power lift motor to fix a micro mill fine feed issue, and do not buy a spacer expecting power lift performance.
Rule 3: Check the existing drive before ordering a power lift: The power lift motor is intended for mills that already have a power lift on the Z-axis drive. If your mill does not have that drive, the motor alone may not be enough. Confirm your Z-axis drive setup before spending USD 145.67.
Rule 4: Treat the fine feed spacer as a service part: At USD 2.37, the spacer is a low-risk replacement for the micro mill fine feed assembly. Keep one on hand if you service micro mills regularly. Buy it to restore function, not to upgrade speed or effort.

Product Facts

Motor, Z-Axis Power Lift, HiTorque Bench Mill Deluxe: Z-axis power lift motor for the HiTorque deluxe large bench mill and SIEG SX3.5 large bench mills with a power lift on the Z-axis drive. It is a direct fit for those specific mills, so you avoid adapting a part that was not designed for your machine.
Spacer, Z-Axis Fine Feed: Replacement spacer for the Z-axis fine feed assembly on the micro mill, measuring 28 mm outer diameter, 10 mm inner diameter, and 5 mm long. This is a low-cost maintenance part for micro mill owners, not a power lift upgrade for large bench mills.

Which Upgrade Fits Your Situation?

Best for

Owners of a HiTorque deluxe large bench mill or SIEG SX3.5 large bench mill with a power lift on the Z-axis drive who want to reduce manual head cranking.
Micro mill owners who need to replace a missing or worn Z-axis fine feed spacer during maintenance.

Not for

Micro mill owners expecting a power lift motor to fit their machine.
Large bench mill owners looking for a performance upgrade from a fine feed spacer.