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<div>Alan, I rarely can machine to the tolerance your talking about. I cheat and get very close then finish with a real good flat file then polish the part with progressively finer wet and dry sand paper. I will go right down to 2000 grit some times.. I am not sure if it is me or the lathe.</div><div>Hank</div><div><br></div>
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On Thursday, March 29, 2018, 8:43:07 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div dir="ltr">Thanks Hugh,<br clear="none">I'll have a look in the shops after easter to get a handle on whats available.<br clear="none">On the net there seems to be quite a range in prices from about $30- to thousands.<br clear="none">Always enjoy visiting your premises & seeing the Q-sub and would appreciate<br clear="none">any advice with this precision machining. <br clear="none">How is the Q-sub going?<br clear="none">Cheers Alan<br clear="none"><br clear="none"><br clear="none"><br clear="none">Sent from my iPad<br clear="none"><br clear="none">> On 30/03/2018, at 2:03 PM, Hugh Fulton via Personal_Submersibles <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">> <br clear="none">> Alan, You are really brave to try and measure that way. Even tele gauges<br clear="none">> are hard unless you have a lot of practice with them but not with calipers.<br clear="none">> You have to use them with an outside mic to give you a fighting chance as<br clear="none">> you have just found out. You should be using a bore Micrometer or at least<br clear="none">> inside mic for bearing fits. I think you should pay a visit out to our<br clear="none">> workshop if you are planning on doing that sort of thing in future. So much<br clear="none">> is in the feel using instruments. CRC do a freeze spray for that sort of<br clear="none">> thing as well. As the guys say get the manufacturers recommendations. The<br clear="none">> bearings are not universal as they come in different clearances such as C3<br clear="none">> or C4. Hugh <br clear="none">> <br clear="none">> -----Original Message-----<br clear="none">> From: Personal_Submersibles [mailto:<a shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org" href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br clear="none">> On Behalf Of Alan via Personal_Submersibles<br clear="none">> Sent: Friday, 30 March 2018 9:49 AM<br clear="none">> To: Personal Submersibles General Discussion<br clear="none">> Subject: Re: [PSUBS-MAILIST] Press Fit<br clear="none">> <br clear="none">> Thanks for the advice guys.<br clear="none">> The bearing diameters are 35 & 24mm.<br clear="none">> I went to a lot of fuss last time I did this & ended up having to use<br clear="none">> loctite as the last pass on the lathe took too much off.<br clear="none">> Emile, I will shoot for .02-.03mm & see how that goes. Have found other<br clear="none">> advice saying .03. But found a lot of confusing information googling.<br clear="none">> I was intending to heat & freeze parts prior to pressing.<br clear="none">> Hugh, I have been using inside callipers & measuring off these with the<br clear="none">> digital callipers.<br clear="none">> The digital callipers are on the cheap side so may upgrade them & as you<br clear="none">> say, purchase telescopic gauges the right size.<br clear="none">> Also on my radar is a 10 ton hydraulic hand operated press, as I am also<br clear="none">> press fitting the two end sections of the thruster in to a tubular middle<br clear="none">> section. I am figuring that with epoxy in the press fit, screws & an epoxy<br clear="none">> paint finish it should be water tight without o-rings.<br clear="none">> Cheers Alan<br clear="none">> <br clear="none">> <br clear="none">> <br clear="none">> <br clear="none">> Sent from my iPad<br clear="none">> <br clear="none">>> On 30/03/2018, at 8:42 AM, Hugh Fulton via Personal_Submersibles<br clear="none">> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">>> <br clear="none">>> Alan,<br clear="none">>> What diameter is the bearing?<br clear="none">>> As the guys are saying it is a real test of your machining accuracy. <br clear="none">>> Do you have a micrometer and telescopic gauges the right size? If you <br clear="none">>> are relying on digital calipers you are playing with fire. The answer <br clear="none">>> to your question is yes you can push the bearing in with the tailstock <br clear="none">>> but they don't have much push. You can use a vice as well if it is in <br clear="none">>> good condition. I suspect you are talking about something that is <br clear="none">>> possibly only 30-40mm. It is very easy to over machine but you can use<br clear="none">> Loctite if you want to.<br clear="none">>> Suggest you try a bit of aluminium bar as a test piece first. Easy <br clear="none">>> to machine it off after or push it right through.<br clear="none">>> Hugh<br clear="none">>> <br clear="none">>> -----Original Message-----<br clear="none">>> From: Personal_Submersibles <br clear="none">>> [mailto:<a shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org" href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br clear="none">>> On Behalf Of Alan via Personal_Submersibles<br clear="none">>> Sent: Thursday, 29 March 2018 10:33 PM<br clear="none">>> To: <a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br clear="none">>> Subject: [PSUBS-MAILIST] Press Fit<br clear="none">>> <br clear="none">>> Hi,<br clear="none">>> I'm wanting to press fit a bearing in to my aluminium thruster housing <br clear="none">>> & wondering if I could make a tool slightly less in diameter than my <br clear="none">>> bearing, fit it in the lathes tail stock, & wind it in to force the <br clear="none">>> bearing in to the press fit.<br clear="none">>> I have heard figures like 500lb force being used for press fitting, <br clear="none">>> which I won't get winding the tail stock, & probably don't require as <br clear="none">>> there is not a lot of dynamic force on the bearing.<br clear="none">>> I imagine there will be a lot of trial & error involved getting the <br clear="none">>> bore to the right diameter, & this method will allow me to keep the <br clear="none">>> work in the chuck & keep doing fine passes until I get it to the right<br clear="none">> diameter.<br clear="none">>> Any thoughts or experience with this thanks.<br clear="none">>> Alan<br clear="none">>> <br clear="none">>> Sent from my iPad<br clear="none">>> <br clear="none">>> _______________________________________________<br clear="none">>> Personal_Submersibles mailing list<br clear="none">>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div class="yqt1268327325" id="yqtfd27291"><br clear="none">>> <br clear="none">>> _______________________________________________<br clear="none">>> Personal_Submersibles mailing list<br clear="none">>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">> <br clear="none">> <br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">> <br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div></div>
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