Slotter Pledge

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The actual slotting head we'd like to buy.

This pledge is for a Slotting Head to fit the Bridgeport mill, the example in mind being an Original Equipment type E Head.

What it is

A slotter cuts square edged holes in metal, usually for keyways to hold gears onto shafts or splines, and also allows forming of gears from scratch and v-grooves which would otherwise be impossible by milling.

The ability to make keyed parts would be both a useful addition to our capabilities, and a boon to our ability to repair the other machines in the space.

Video of a Bridgeport Slotting Head in action


£550 + Collection in Mansfield

Link to advertisement.


In under 12 hours from the start of the pledge drive we reached our goal. As of 14/08/2018 the Slotter has been purchased on eBay, and the sellers bank details passed to the trustees to arrange payment on behalf of the space.

As of 18/08/2018 the slotter is installed and working.

Keen users should be aware that it takes 5/8" round HSS toolbits; the 5/8" size is now depreciated, and the only supplier of new material is Cromwell tools at around £24 per Bar. Steel and hardened set-screws are on-order to build a tool-holder to allow the machine to accept standard 1/2" and 3/8" square HSS toolbits, in the coming weeks.

List of pledges

Please only post on the Google Group mailing list if you really, truly have forgotten your HMS password and need to have someone else to update this.

Who How Much Paid? Method Paid
Joshua Kelly £235 Yes BACS
Tom Grover £200 Yes BACS
'RepRap' Matt £25 No N/A
James Berry £50 Yes Cash to James Adams
Steve Barnett £20 Yes BACS Ref: SLOTTER-SB
Russell Houghton £20 No N/A