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Re: ER Collet nut
¿ªÔÆÌåÓý
On 2/15/2023 10:03 AM, mike a wrote:
??? ??? My thought is to ??? ??? 1 . Make your pass ??? ??? 2. Back the tool out .???? ??? ??? 3. Power the lathe off leaving the halfnut engaged . ?? ???? 4 . Use the hand crank to move the carriage to original starting point? . ??? ??? 5. Rinse , repeat . ??? ??? but I could also just be pounding sand
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Re: ER Collet nut
¿ªÔÆÌåÓý??? ??? ??? I believe if you have a hand crank on the outboard spindle it will work , but I will not be able to test that theory for a couple 3 weeks.. ??? ??? animal On 2/15/2023 9:18 AM, m. allan noah
wrote:
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Re: ER Collet nut
¿ªÔÆÌåÓý??? ??? If your threading SLOW that would be a good time to have a crank on the outboard end of the spindle????? . That will probably be my MO when I attack this project . I'm hoping to bring my 9A over to my new shop in the next 2-3 weeks . Wife is finishing up with the drywall screws & hope to have it painted this weekend? . Then I have to wire & I'm thinking of raising the bench? that the lathe is on & pouring a concrete pedestal to raise the mill up some . I'm getting to the point that I can only work within a certain range of my arms & the slightest angle I put my body in can ruin my next couple of days . I have a metric threading ? but I'll start a new thread for that . ??? ??? animal On 2/15/2023 7:58 AM, Andrei wrote:
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Re: ER Collet nut
¿ªÔÆÌåÓý
Yup,?
You are right. I just re-watched this video from Abom79. He does the metric threading on his imperial lathe, starting at minute 11:40.?
He does start at the same number (1 in his case, with the blue dot), but he DOES NOT disengage the half nuts.?
From: [email protected] <[email protected]> on behalf of m. allan noah <kitno455@...>
Sent: Wednesday, February 15, 2023 12:18 PM To: [email protected] <[email protected]> Subject: Re: [SouthBendLathe] ER Collet nut ?
Too bad it isn't true.
allan
On Wed, Feb 15, 2023 at 11:53 AM Andrei <calciu1@...> wrote:
-- "well, I stand up next to a mountain- and I chop it down with the edge of my hand"
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Re: ER Collet nut
¿ªÔÆÌåÓýThere are 5/8¡± 3C collets. They are NOT through collets. They will accept work 1¡± deep however.?Jim B, On Feb 15, 2023, at 12:04 PM, William Nelson <wnnelson@...> wrote:
-- Jim B |
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Re: ER Collet nut
m. allan noah
Too bad it isn't true. allan On Wed, Feb 15, 2023 at 11:53 AM Andrei <calciu1@...> wrote:
-- "well, I stand up next to a mountain- and I chop it down with the edge of my hand" |
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Re: ER Collet nut
Well that would have been the tricky part. I would have put in my 5/8" 6k collet. I'm able to put my 3 or 4 jaw chucks over that. Install a 5/8 ground rod in the collet block and tighten well. Insert the rod and block into the 6k collet and tighten that. Use the 3 or 4 jaw to hold the collet block. Check to make sure everything is square and concentric which could be a sticking point. Then bore and thread. Not sure how well threading would be in the hardened collet block but one never knows until he tries.
-- Bill From Socal |
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Re: ER Collet nut
¿ªÔÆÌåÓý
Yes, that is the plan, anyway. ?
From: [email protected] <[email protected]> on behalf of Rick <vwrick@...>
Sent: Wednesday, February 15, 2023 11:49 AM To: [email protected] <[email protected]> Subject: Re: [SouthBendLathe] ER Collet nut ?
Are you saying you can just disengage the half nut, hand crank the carriage back, and restart on the same number?
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Re: ER Collet nut
Are you saying you can just disengage the half nut, hand crank the carriage back, and restart on the same number? On Wed, Feb 15, 2023 at 10:58 AM, Andrei wrote:
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Re: ER Collet nut
? I thought about this, but how would you indicate it in so as to minimize runout? ?The taper would be facing the chuck, so you couldn¡¯t indicate it on that, maybe on the relief cut? On Wed, Feb 15, 2023 at 09:51 AM, Dallas wrote:
I still regularly use the collet chuck I made from scratch and I recommend the project. However if I were going to make another I would buy a hex body collet chuck bore out the back side and thread to fit my spindle. You can buy these for $25 or so and get any ER series you want. They all come with nuts and some have handles for a similar price. This would save threading the collet nut thread and making the tapered bore for the collet. The hex body collets will work as is for small spindle lathes like the 618.? |
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Re: ER Collet nut
¿ªÔÆÌåÓý
The only difference between metric and imperial on using threading dial is that with metric you have to start ON THE SAME mark, every time.?
From: [email protected] <[email protected]> on behalf of William Nelson <wnnelson@...>
Sent: Wednesday, February 15, 2023 10:55 AM To: [email protected] <[email protected]> Subject: Re: [SouthBendLathe] ER Collet nut ?
I had that idea a while ago as I had some parts to make that would have been easier to leave in the chuck and go back and forth to the lathe and mill. I considered using carbide tooling to thread a commercial hex block as there was sufficient wall thickness
for the threads. I never got around to it but it is still in the back of my mind. If I had a surface grinder making one would be much easier. I have a 10k and have used the printed gears from Ebay with great success making metric threads. I believe I saw a
way to use the threading dial on you tube but never tried it. Something about using the same mark on the dial I believe but don't hold me to it.
-- Bill From Socal |
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Re: ER Collet nut
I had that idea a while ago as I had some parts to make that would have been easier to leave in the chuck and go back and forth to the lathe and mill. I considered using carbide tooling to thread a commercial hex block as there was sufficient wall thickness for the threads. I never got around to it but it is still in the back of my mind. If I had a surface grinder making one would be much easier. I have a 10k and have used the printed gears from Ebay with great success making metric threads. I believe I saw a way to use the threading dial on you tube but never tried it. Something about using the same mark on the dial I believe but don't hold me to it.
-- Bill From Socal |
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Re: ER Collet nut
I made an ER32 collet chuck for my Atlas 618 several years ago and love the ER system.? I turned this one from piece of round stock, threaded the inside for lathe spindle, outside for purchased ER nut, drilled a hole for a spanner wrench, and bored the inside taper.? It works perfectly and I use it all the time.? I bought fractional collets and in retrospect would recommend metric instead.? Before you buy your collets, look at the grip range inch vs mm.? There are some gaps in the inch sets, just a point to consider.? This was quite a bit of work because I made threads fit as close as I could and made nice finished surfaces.
Metric threading is no problem, you just have to leave lots of relief room at the end of the threads for the lathe to stop, leave half nuts closed, and reverse the motor to starting point.? The closest change gear to give you the tpi works fine. I still regularly use the collet chuck I made from scratch and I recommend the project. However if I were going to make another I would buy a hex body collet chuck bore out the back side and thread to fit my spindle. You can buy these for $25 or so and get any ER series you want. They all come with nuts and some have handles for a similar price. This would save threading the collet nut thread and making the tapered bore for the collet. The hex body collets will work as is for small spindle lathes like the 618.? |
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Re: ER Collet nut
m. allan noah
I don't know about the collet chuck drawing, but I provided that threading info a few years ago. Glad to see someone making use of it. When threading, I use the same method DJ showed, so I can use a much narrower runout groove. Some parts I make require that. allan
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"well, I stand up next to a mountain- and I chop it down with the edge of my hand" |
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Re: ER Collet nut
Here is a picture of the one for my SB13. Note the relief groove, plenty of room for the spindle to park.? This is a schematic I found on the internet, it is what I used to make mine. I don¡¯t know who to give the credit to for it, or I would. Here is some info that is posted on this site about the gears needed to do metric threading on a SB9. ? Something I like to do with info like this is print it out, laminate it, and keep it with my lathe tooling, so I can always find it again. |
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Re: ER Collet nut
? The spindle stops in the relief groove. Therefore, no variation in the thread. On Tue, Feb 14, 2023 at 10:50 PM, Andrei wrote: You only back out the cutter after the spindle stops? Not when you get to the end of the thread? Is there much variation where the cutter ends up? |
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Re: ER Collet nut
On Wed, Feb 15, 2023 at 12:43 AM, DJ Delorie wrote:
"Rick" <vwrick@...> writes:?I¡¯ll concede that he is using the threading dial, but not how one would normally use it. What he is doing seems like a lot more work, for what advantage? I think he is just introducing another chance of making a mistake while threading. The relief groove is plenty wide to stop the machine in without drama. |
Jim_B