Homemade Tool Post Grinder - part 11 (labyrinth seals)

The next natural project for me is to make a tool post grinder to use on my Colchester Student lathe. I also have the need for a cutter grinder and so the thought occurred that perhaps I could design a tool post spindle and drive which could also be part of a cutter grinder. If I had sufficient space in my workshop I probably would have looked for a Clarkson Cutter Grinder to refurbish and focussed instead on making just the tool post grinder. Taking all things into account, designing my own combination machine seemed to be a reasonable proposition. In part 11, I test the frictional resistance of the installed rotary lip seals and discover that the drag is excessive. At the design speed this would absorb about 390W which is about the rated power of the motor I am expecting to use. Clearly an alternative solution is required. Alternatives might have been to use single lip seals, low friction seals. I opted to dispense with the lip seals altogether and go for labyrinth seals. In this video present a design which utilises existing components and finish all the parts for the conversion. Final assembly and testing will be the subject of the next video. 00:00 Introduction to the content of this video 00:19 Testing the frictional drag of the installed lip seals 03:26 Ancillary parts to aid assembly and disassembly 04:50 Removing the internal components in the arbour press 06:05 Calculating power wastage/heating due to lip seal friction 06:58 Alternative labyrinth seal design 09:50 New parts drawing 10:34 Modifying the spindle to include a shoulder for labyrinth seal and reduced interference with bearing inner races 14:06 Order of machining of the 4 labyrinth seal components 15:02 Turning labyrinth seal rotating components 18:22 Undercutting bore for adhesive retention 18:36 Parting off 19:08 Showing to completed rotating parts 19:48 Turning the two static seal components 22:00 Parting off 22:31 Modifying the two end caps 24:30 Showing completed labyrinth seal components 27:03 End See also: Part 1 - Making the body of the clamp:    • Homemade Tool Post Grinder - part 1 (spind...   Part 2 - Making the 'yoke' which clamps in the tool post:    • Homemade Tool Post Grinder - part 2 (compl...   Part 3 - Spindle body:    • Homemade Tool Post Grinder - part 3 (spind...   Part 4 - End caps:    • Homemade Tool Post Grinder - part 4 (end c...   Part 5 - Deep hole drilling of spindle:    • Homemade Tool Post Grinder - part 5 (deep ...   Part 6 - Centre turning the high speed spindle:    • Homemade Tool Post Grinder - part 6 (centr...   Part 7 - Completing the spindle:    • Homemade Tool Post Grinder - part 7 (compl...   Part 8 - Bearing preload assembly:    • Homemade Tool Post Grinder - part 8 (beari...   Part 9 - Small pulley with poly v-grooves:    • Homemade Tool Post Grinder - part 9 (small...   Part 10 - Internal keyway cutting:    • Homemade Tool Post Grinder - part 10 (inte...