This is the power feed I used:
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To install X axis power feed to HF626 mill and keep hand wheel.
Steps:
1. Need to extend the x axis lead screw shaft by 3.188"( 4.188" Overall length). if you follow this setup. You need to turn a 1 inch long reduced diameter on this stub shaft to insert into a bore that you will drill into the existing lead screw shaft. I don't recall what the diameter of this bore was, approx. 3/8". But you need to be careful so there is enough wall thickness around the bored hole for strength and dowel pin.
2. I made the bore a slip fit (0.001") to the stub shaft. Use a lathe for minimal runout.
3. Mill the 5mm keyway.
4. I cross drilled the stub shaft and lead screw shaft when assembled for a 1/16 dowel.
5. Assembled stub shaft to lead screw shaft with loctite sleeve retaining compound and pressed the dowel in with it as well.
6. Machine a 5mm keyway in the brass gear hub from the power feed kit. The hub comes with a small keyway already but its too small. The 5mm keyway does not need to go the entire length of the gear hub. About an 1 inch or so is good. I used the lathe and cross feed as a manual shaper and slowly cut the keyway. Check out youtube on this.
7. I also drilled and tapped a M5 set screw hole into the gear hub. (I milled a small flat on the lead screw shaft for this as well). This set screw will allow you to set the engagement of the brass gear into the pinion gear on the power feed housing and keep it there.
8. Assemble the lead screw w/stub shaft into the mill. You will notice there is approx. 5/8 of the shaft past the c-clip near the table bearing housing. Put the caged needle bearing from the kit on this and hang the power feed unit. Locate two M6 capscrew holes and drill/tap them into the table bearing housing. This secures the unit to the table. (Once mounted, I found there was no need for the caged needle bearing but I left it in.)
9. I made an aluminum trim ring to enclose the brass gear hub and give the handle dial a surface for it to mate against. It slip fits into the power feed housing and has enough clearance around the brass gear. It is a tight fit. I use a little RTV silicone to hold the aluminum trim ring in place and not turn with the dial.
10. With the trim ring in place, just slip on the handle and secure with the set screw.