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Colchester Bantam Lathe

Fixed travel stop

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Richard Masters 120/02/2011 21:23:50
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3 forum posts
I have a travel stop that can be clamped to the bed.
If I use the lathe with power feed on, does the half nut automatically disengage when the saddle come up to the stop? Or should I only use the lathe under manual feed when coming up to the stop?
chris stephens21/02/2011 00:05:08
1049 forum posts
1 photos
Hi Richard,
If yours is like mine, the feed cuts out when it encounters the stop, but NOT repeat NOT when screw cutting. The stop is a very useful accessory, I use mine regularly.
If you haven't used yours yet do a test run first, in case someone in the past messed with the release mechanism.
A cross slide stop is a useful feature, especially when screw cutting, but it can get in the way on other occasions.
christephens
Dusty21/02/2011 09:33:14
489 forum posts
9 photos
Hi Richard
You do not say which lathe you have. Most lathes used by Model Engineers do not have the facility for half nuts to automatically disengage. These features are generally only found on the more expensive or larger lathes. If your lathe is so fitted then as Chris sugests try it first. Do not clamp the stop to tightly to the bed so that if the worst happens you do not damage the lathe. Having read the header I see that it is a Bantam.

Edited By Dusty on 21/02/2011 09:34:39

Chris Gunn21/02/2011 14:09:23
429 forum posts
27 photos
My Bantam is the same, and the stop is indeed very handy. My tip would be to ensure the 2 clamp screws are both tightened securely, otherwise it may slip. When I tighten mine, first then second screw, the first can always be tightened a little more, as the "C" section clamp must spring a touch after the second screw has been tightened, loosening the first screw a touch as well. Just get in a routine of doing a double tighten of everything, and you should be OK. If you are doing a job with a long feed, you can walk away and do something else, while keeping an ear and an eye on the lathe, until you hear the clunk to let you know the feed has tripped. I am sure you will be happy with the Bantam, it is far superior in lot of ways to many lathes available to the model maker.
Chris Gunn
Dusty21/02/2011 19:57:00
489 forum posts
9 photos
Hi Chris
I was not advocating that the stop should not be tightened properly when in normal use. Just for the trial run. Once Richard is happy with the operation then the stop as you say should be clamped up firmly.
Martin Cooper21/02/2011 22:29:20
16 forum posts
2 photos
Hi All
 
My Bantam saddle stop has single clamp bolt. I find that on fine feeds, the saddle just tends to push the stop along the bed - even with it clamped up really tight. I've read about dismantling the apron and adjusting the mechanism inside - but does anyone have any other tips here?
 
Thanks
 
Martin
 
 
 
 
 

Richard Masters 121/02/2011 22:46:53
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3 forum posts
Thank you all for your prompt replies.
My stop has a single grub screw to clamp it to the lathe bed.
I will do as you suggest. ie lightly clamp and see what happens when the sadle meets the stop under power feed. I don't have time tonight to get to my workshop, nor tomorrow, but should have time on wednesday.
I will let you know what happens.
 
Chris Gunn22/02/2011 12:51:51
429 forum posts
27 photos
Dusty, I was not referring to your comment at all, which makes complete sense for the initial test, it was just a general bit of advice, which now seems pertinent after reading the later posts. My stop is the genuine Colchester article, and has 2 Allen cap screws, not grub screws holding it to the bed. The cap screws may not be original, but they allow the use of a bigger Allen key than the corresponding grub screws would. If I am sloppy about tightening it, then one soon knows about it when the chuck jaws destroy the tip of the tool. I always have a test run, with the tool well away from harm, before I get cracking. I wonder if the stops mentioned above are genuine Colchester parts, and why the design has only one locking screw?
Chris Gunn
chris stephens22/02/2011 14:22:06
1049 forum posts
1 photos
Hi Guys,
Before we start to worry too much about whether parts are genuine or not, my saddle stop (genuine Colchester) has one Allen headed cap screw to draw a brass block into tight contact with the underside of the lathe bed.
The cross slide stop, as illustrated in my handbook, has two screw to hold it to the cross slide, and also two screws to hold the other part to the saddle.?
chriStephens
dan quirke29/08/2011 16:52:17
2 forum posts
Hi,
I have a "Bantam" mk 1 800 rpm.I have just modified the speed range from 0 to 2000 rpm,using an inverter with potentiometer control.It works very well with the facillity to reverse and jog the spindle with variable speed ranges to suit the situation.Screw cutting is now completely under control,into blind holes ect.I can pass on information about the pro's and con's to anyone interested.I have a question:The camlock mechanism on spindle nose which locates chucks ect,on my machine ,has three location pins,which are locked onto spindle with cams which are turned to lock.These rotary cams are located with a location pin,spring and screw.These items retain the cam in position.I have lost these items and wish to replace.Can anyone help?
Trevor Wright21/02/2012 13:05:34
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139 forum posts
36 photos

Dan, are you looking for the pins or the internal mechanism? the pins can be bought new from RDG tools

I am looking for a 127 tooth change gear for my mk1 bantam, can anybody point me to a supplier.?

Failing that, what gear form are the gears? I can buy a standard gear and fit a splined inner.

dan quirke21/02/2012 14:53:58
2 forum posts

Hi,

In answer to your qestions:the gear form is 16DP.You can contact Kevin@millhillsupplies.com

01787-472236 .I think he has one in stock,or,maybe can have one manufactured.I can give you

o/d of gear and spline detatails if you require

Neil Greenaway21/02/2012 15:30:45
71 forum posts
3 photos

There was an article in a recent MEW about rebuilding and adjusting the saddle trip mechanism on a colchester lathe (cant remember if it was a student or a bantam) - might be worth a look.

Yoram18/03/2013 05:02:11
9 forum posts
9 photos

Hi All.

I just bought a colchester bantam and looking for parts catalogue or manuel which will anable me to start servicing ang fixing it, as it is in rather neglected state.

I could not find it in the net. would be very thankfull for any help. Thank You..

Muzzer03/05/2013 05:43:09
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2904 forum posts
448 photos

Hi Yoram

Did you get a catalog and manual yet? If not I can send you a link to them on my Google Drive.

Let me know if I can help.

Murray

Yoram03/05/2013 06:21:12
9 forum posts
9 photos

Hi Murray. Thank you very much . I had recieved pages from the manual by the kind Mr. John Connagham, but not the manual as a whole. There is a possibility that som information is missing, I would be most thankfull for a link. my mail is yb269ali@gmail.com Thankfully Yours Yoram Binur

Sandy Winstanley28/05/2014 21:37:11
2 forum posts

Hi, everybody. New kid on the block. Talking of saddle stops-I am looking to make one for my Bantam mk 1 as they seem to be about as common as hen's teeth but could do with the internal profile. Dimensions I can work out from that. Would anybody who has one be so kind as to park it on a sheet of paper and draw round it? It would be greatly appreciated. Thanks in advance. Sandy

Ady129/05/2014 10:48:15
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5067 forum posts
734 photos

Did you get a catalog and manual yet? If not I can send you a link to them on my Google Drive

Bear in mind that anything you ever upload to Google Drive, also basically belongs to them and backup copies on Google servers will remain even after you delete your files

[Google has broad rights to reproduce, use, and create derivative works from content stored on the Google Drive, via a license from its users. This license is perpetual even after the user removes the material.]

FMES29/05/2014 10:58:10
608 forum posts
2 photos
Posted by Richard Masters 1 on 20/02/2011 21:23:50:
I have a travel stop that can be clamped to the bed.
If I use the lathe with power feed on, does the half nut automatically disengage when the saddle come up to the stop? Or should I only use the lathe under manual feed when coming up to the stop?

Richard, if memory serves the feed engaging lever on the Bantam / Student Lathes has a tension adjuster incorporated.

If you unscrew it the amount of force required to enable the feed to disengage when hitting the stop reduces.

Normally it was screwed in enough to overcome feed friction plus about half a turn.

Lofty

FMES29/05/2014 11:00:19
608 forum posts
2 photos
Posted by Trevor Wright on 21/02/2012 13:05:34:

Dan, are you looking for the pins or the internal mechanism? the pins can be bought new from RDG tools

I am looking for a 127 tooth change gear for my mk1 bantam, can anybody point me to a supplier.?

Failing that, what gear form are the gears? I can buy a standard gear and fit a splined inner.

Trevor, did you find a change wheel? I have some odd ones lurking in the workshop that were stripped off a Bantam or Student when they were disposed of (thought they might come in handy)

If you still need I can check for a 127.

Lofty

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