13 Attachment(s)
Multi stop with automatic feed trip for Colchester Student 1800
Hi All
I am a massive fan of stops on my lathe. So when I use my Acrogrip lever operated collet closer the bed stop is unable to be used as the chuck is removed and a collet closer fits in the headstock. As this is a gapped bed model lathe, the bed doesn’t allow the stop to fit close to the headstock. (See photo below)
Attachment 50113Bed of lathe doesn’t extend to headstock.
So I decided to make a multi stops which could also be used to trip the power feed.
This was made a lot easier as Colchester made a multi stop which is shown in the official manual. I have never used or seen one but this gave me a good starting point to design my own.
The stops are operated by a lever at the tailstock end with a ball bearing detect giving a positive indexing rotating the shaft to the desired stop. The six stops are fit with a stud so fine adjustment can be achieved. A paddle hits the stops under the carriage which then activates a push rod to disengage the feed lever. When the stop mechanism is not in use the paddle can be swung out of the way so the carriage can move with no engagement of any of the stops.
The accuracy of the trip system is 0.01mm. So with careful setting, parts can be easily manufactured to the correct lengths with great repeatability.
The photos below show the multi stop installed on the lathe and some of the building of the unit.
Attachment 50124 Attachment 50125Completed multi stop installed.
Attachment 50117Machining slots in main shaft.
Attachment 50123 Attachment 50114
Attachment 50116Two stops fully machined. The key pad aligns the stop on the main shaft and locks the stop in position along the shaft.
Attachment 50115Stops fitted to main shaft.
Attachment 50118Stops locking grub screws on to key pads.
Attachment 50119Stop selecting lever (X6 position)
Attachment 50120 Attachment 50121 Attachment 50122
photos of the trip mechanism to disengage feed.
Thank you for viewing
The Home Engineer
